This isnt really a cheat, but a glitch in the game. You may need to start over to get Mew, but it is worth it.First you need fly, the third gym badge, a Pokemon lv 10ish and a Pokemon with sleep powder. North of cerulian city is a trainer with a lv 17 ish slowpoke, MAKE SURE YOU DO NOT FIGHT HIM, if you do, you can not get Mew also there is a gambler with some water Pokemon left of lavender town, don't fight him either.
Okay, get a flying Pokemon, a Pokemon with an attack with sleep powder or spore, a level 10 ish Pokemon like rattata, and a bunch of pokeballs, preferably great balls or ultra balls. Teach the flying Pokemon fly, then go to the first town you go into in the game with a Pokemon center, talk to the guy who shows you how to catch Pokemon and let him show you. Then fly to lavender town.save your game, then go west of lavender town, avoid the gambler and go right in front of the enrtence to the underground path. Go south and immidiately press the start button then fly to cerulian city, the gambler will see you as you leave. When you arrive in the town, your buttons will not work, don't be alarmed. Simply go north and let the slowpoke trainer see you so that it walks up to you, either that or talk to him, if your game freezes, restart and do the gambler thing a gain then try the other slowpoke trainer method. Defeat him and your buttons will work again. Fly back to lavender town, then go east and save your game at the entrance of the path to the route, when you enter the route, your menu will open, push b to close it (you have to push b or it wont work) When you close the menu, you will hear the traditional music and scene before a battle and after the scene is over you will see a Mew on the screen. Battle it with the lv 10 ish Pokemon you brought and when it is low enough on health, switch to you sleep powder/spore Pokemon and put it to sleep, then chuck great/ultra balls at it untill you catch it, now you have a mew.
This is tested and works, I don't know if it will work for yellow, but I have used it more than enough times for it to be believable. You don't need a game shark or anything, and it shouldn't ruin your game,
P.S. This was written from memory so I'm not sure if it accurate, but I did the glitch from memory, so it should be fine

Ok you guys.... You can get Pinsir and Magmar in Pokemon Red without having to trade from Pokemon Blue. If you do the Mew thing to the most southeast engineer, you will get Magmar. If you do the Mew thing with the Gentleman closest to your Rival on the S.S. Anne, you will get Pinsir. I've been doing it since I found out and got many Pokemon. The gambler closest to Snorlax will give you a Missingno. If you go to the Bug Catcher on Route 6 that is closest to Vermilion City, You will get a Chansey. All of these Pokemon are level 7. I've gotten all of Route 25, Route 6 and Route 8. I accidentally battled the guy so I couldn't finish the S.S Anne area. However, you can't do the cheat on your Rival or any Gym Leader.

Yes we all know that you can catch missingno by talking to the coffee dude in viridian. Now, try this. Go to viridian city, talk to the coffee guy and SAY YES. Watch him catch the weedle. DONT TALK YO HIM AGAIN. FLY to FUSHIA and go south like your going to seafoam islands. GO TO SEAFOAM ISLANDS. Surf up and down THE BEACH. DONT GO PAST THE WHITE THINGS. Eventually, you will run into missingno. KEEP READING. Someone said that if you do missingno this way, ( run or kill him) you will eventually run into WILD MEWTWOS. I tried it and messed up. If you do catch a WILD MEWTWO, EMAIL ME AT yozz33@gmail.com.....thanks.

Tired of versing pokemon?heres a little tip

You can actually cut certain types of tall grass,it may take a little time but it's better then versing 100's of Pokemon while searching for the next place you want to go

You have to have surf,go to the truck(it is not an easter egg ass hole)go to it and use the card key and you will get into it and it will move.then,you get out and you fight mew(only use great balls on it)it is easy to catch it's on lv.7.

Ok this is something that I tried 1st and it worked
I first found this out on accident that putting any unsellable items 6th in your pack doing the missingno. Cheat and it cloned and got me mad

Anyway if you want more than one aerodactyl or kabuto(or omanyte depending on the fossil you chose) put your fossil 6th in position and do the missingno. Cheat.
With your fossil 6th in your pack then you'll have 130 of it. Go to that doctor in cinnabar, where your so conveniently located, and give him your fossil.
Walk out the door and immediately go back in and do it again and you have you more fossil pkmn! More aerodactyls, kabutops, and/or omastars can be traded or used for an army
Use your imagination you find something

To duplicate items in blue red and yellow you need to be at cinnibar island. If your there talk to the guy that shows you how to catch Pokemon in the begining. Then fly to cinnibar island and use surf. Stay on the edge of island without moving farther into the ocean. Keep going back and forth on the edge and keep pressing a and b untill you find the Pokemon called missingno. Kill it and it will duplicate the seventh item in your bag

Ok so first you need to catch an abra. This can be done on route 8. To the west of nugget bridge theres a kid that says "i say your feat from the grass" don't fight him. With you're abra, right before he sees you, you need to press start and teleport. You should go to cerulean city. Go to the gym and fight the first trainer. Beat him, and walk up negget bridge. Your start menu will pop up. Just press b and you will be in a battle with Mew lv 7. Do the same thing only with any other person you can fight EXCEPT the guy you teleport from, and you should get a bunch of different pokemon. (i did the other trainer in the gym and got staryu and I also have a lv 7 nidoqueen and a cubone and I still havn't gotten to bills house yet.) I'm guessing that if you teleport to any other Pokemon centre, you can fight other trainers and fly to nugget bridge. If the last part doesn't work I'm srry but I'm just assuming.

Later

Even after you have completed the S.S Anne portion of the game you can go back after it leaves.
1.get to VERMILLION where you will walk along the docks untill to get to the sailor that tells you the S.S Anne has left.
2.stand so that you are not directly next to him but diagonally up from him.
3.walk to your right and face the water.
4.select start and save your game.
5.restart your game.
6.select start again and choose the Pokemon that has surf...activate it and you will be on top of the sailor. Press the directional pad down and you will be behind the sailor and free to walk into the place where the boat is. from there you can enter the boat once more or surf around and find the truck.

Everyone knows that missing no will duplicate one of your items by now , and everyone knows where he is. Well he actualy does 2 things. I noticed a long time ago, that, wherever you were last befor you do the missing no cheat, those are the pokemone that will show up in his area. For example if you are in the safari zone. Then do the missing no cheat. Pokemon like rhyhorn, or nitoking will show up in the water. You may think "so what" well, in the safrari zone you can't use masterballs....well you can anywhere else. This is how I caught a tarous (my very last Pokemon to make all of them) afte ri got him, I went and got my certificate :)

Look you need concentration, time, pokeballs , and good pokemon.
First go to route 3 and catch a jigllypuff that has the move sing (very important) and continue your journey normaly until you get to the city with misty as the gym leader. Don't battle the trainer on that cape thing (you know just before you have to surf to get to mewtwo.) catch a abra that knows teleport (every abra does) with a jigglypuffs sing and there is a high catch rate. After catching the Pokemon save and go infront of that trainer I mentioned. Just before he can walk up to you press start and use teleport. Your start button will be disfunctioned and walk balk on to that route and Mew will appear. His level varies from 7-10.

I. Materials

- Calcium
- Rare Candies
- Low Level Pokemon
- Max Repel
- Pokemon With Fly
- Pokemon With Cut
- Access To Fuchsia
- Access To Lavender

II. What To Do With Your Low Level Pokemon:

- Take the rare candies and level it up (make sure that it's special is under 21.) Then use the calcium to get it's special up to exactly 21. That is the standard decimal number for 15 in the hexadecimal system used by this game. 15 is the number that determines what species the Pokemon is. In this case, the number 15 represents Mew.

III. Step-By-Step Instructions

1. Fly to Lavender Town.

2. Go left into Route 8 and stand in front of the door to the entrance of the underground tunnel connecting Celadon City and Lavender Town (don’t fight the gambler who is standing in front of it.)

3. Save your game, just in case.

4. Make sure that your Pokemon with a special of 21 isn’t in the first place of your party. You don’t want him leveling up on accident.

5. Use a max repel.

6. Make sure that you are directly under the door in alignment with the gambler below.

7. Walk down one step and press the ‘pause’ button before the gambler sees you.

8. Go to ‘Pokemon’ and select your Pokemon that knows fly and fly to Fuchsia.

9. The exclamation point will appear above the gambler’s head as if he has seen you and you will fly away.

10. Now you won’t be able to pause the game because the game thinks that the battle is still going on back at Route 8.

11. Now head out of Fuchsia towards Route 15.

12. Stay in the top layer of grass the whole time and don’t get into any trainer fights yet. While you are walking through the grass, the max repel is making it to where you cannot get into any fights.

13. Head all the way over to Route 14 and make sure that you go inside the left side of the trees.

14. Travel up until you get to 2 bikers facing right and a patch of grass that you have to cut a tree down in order to get to.

15. Fight one of the bikers (this will work with any trainer you want) and make sure that they have to move in order to get to you.

16. Defeat the trainer and now you will be able to pause.

17. ‘Pause’ your game and switch the Pokemon with a special of 21 as the first Pokemon in your party.

18. Use ‘cut’ on the tree and enter the grass area.

19. Walk around and in a short while you will find a ditto (you will only find a ditto because the effects of max repel make it to where you can only find rare pokemon. Ditto is the only rare Pokemon around Route 14.)

20. Attack it with your Pokemon with 21 special and it will use transform and copy your stats including special.

21. Run away from the ditto and immediately fly back to Lavender Town.

22. Go left into Route 8 again and right when you cross the border between Lavender and Route 8, the game will automatically pause, press ‘B’ to un-pause the game and it will automatically go into a battle in which a Level 7 Mew will appear. You will be able to repeat this multiple times to get as many Mews as you want.

Do the glitch city thing then get stuck in the cave. Use surf and keep surfing up youll find cylinder things. Touch themm and your screen would get fuzzy and your game will freeze.

Here's the Mew Glitch:

Stand in front of the entrance to the Celadon City-Lavender Town Underground Path. (You're on Route 8, which is west of Lavender)

Save the game. Step down and press "START" really fast. If he saw you, reset. Go to "POKéMON" and use Fly. Fly to the town where Misty is the Gym Leader. Go up Nugget Bridge. Go the way to Bill's house and battle the Youngster with a level 17 Slowpoke. (Make sure he walks to you or the game will freeze)

After beating him, Fly to Lavender (the Start button brings up the Menu now)

Walk west of Lavender and your Menu will pop-up. Press the "B" button. Mew will appear. He is level seve. Enjoy.

You must have Fly and Surf and you must be as far as Cinnabar Isle.

1. Go to Viridian city.

2. Talk to the OLD MAN and watch him catch the weedle.

3. Fly to Cinnabar.

4. Surf along the right coast and you should encounter Missingno. (and other over level 100 Pokemon depending on your name)

Turn on your GameBoy and when the words:GameBoy flash up, press up and B and the colour of the game will be dark brown. Go to Rock Tunnel and go in and you will see yourself, Trainers and I think pokeballs.

-THIS IS NOT A GLITCH NEITHER WILL IT MUCK UP YOUR GAME-

Have fun cheating!
-mastermarshmallow

P.S You Don't have to use this cheat if you have flash.

This isn't really a cheat, but it's a great way to start a new game. All you need is a link cable and two people who want to start a new game.

First, both people start a new game.One picks Squirtle while the other picks Charmander. They both play until they can buy poke balls and catch pokemon. One catches one Pokemon while the person with Squirtle catches four. Then, they go to a town center where the person trades Charmander for one of the four Pokemon caught by the other one. The person with two bad Pokemon starts a new game. He takes Bulbasaur, plays until he can catch Pokemon and trades it for a second Pokemon caught by the other player. The player with two bad Pokemon starts a new game again. Do this until the player has 2 charmanders, 2 sqirtles and one bulbasaur. The player with two bad Pokemon starts a new game again and takes bulbasaur. He then catches TWO Pokemon and trades them for charmander and sqirtle. In the end, both players are left with all three beginner pokemon.

WARNING: THIS MAY CAUSE SOME OF YOUR POKEMON TO DISSOBEY YOU.

First, do the missingno glitch (where you talk to the guy who teaches you how to catch Pokemon, surf the side of island, bla bla). When you get into a fight with a missingno, catch him. Then, give a rare candy and he will evolve into kangaskhan! It worked for me.

IF YOU DO NOT WANT TO SCREW UP YOUR GAME, DO NOT DO THID GLITCH! MY HALL OF FAME IS COMPLETELY SCREWED UP!(not that I care)

To multiply items you must have fly, surf, and to have been to Cinnibar Island.
Place the item you want to multiply in the 6th position by selecting the item, click select, ant click select when the sixth item is highlighted. Save.
FLY to viridian city, let the old man show you how to catch a Pokemon, fly to cinnibar island, surf on the east coast, you may see other Pokemon first, but keep surfing and you will eventually see MISSINGNO. Or M'. Run. Now you sixth item will look glitchy where the game tells you how many of the item you have. There it is!

Ok here is an accidental cheat I fgound my self. Idk if anybody has posted this cheat becous I was ancius to post it my self. I have bad spelling srry.


Ok. Step one. Do the missingno cheat. Go to varidean and talk to the old man that shows you how to catcxh pokemon. Say no and he show u. Next put any item in you may want 2 duplicate (this is optinal, this you do not have 2 duplicate if you do not want 2 but do incounter misingno "M") put that item in 6th spot of bafg anf fly 2 cinnabar island. Surf on the right side untill you fing a missingno or "M". Catch him. This is why I said about duplication. It eser to catch him w/ masterball and if you got over 10... You got him good. Now put missingno iin party in first slot. Keep surfing up and down untill you incounter anothewr missingno or "M" batle him but don't capture him. And next, you guessed it. Find another one. But this time run away. Now you just go around and battle random Pokemon for about 5 min w/ you're missingo. After that, check you're trainer card. It should be glitched up. Now you should be incountering Pokemon backwords or facing the other way. But if you use another pkmn, it will have you're pkmn backwords 2! For even more intense activity, teech fly 2 missingno and fly 2 ANYWERE U WANT AND EXPERMENT W/ THAT! Have fun.. And be sure 2 ruin you're game and glitch it up till it crap... Have fun

To get infinite items first put the item that you want multiplyed into your sixth slot in your items then fly to Viridian City and talk to the old man.To get to the old man just go north and you will reach him.When the old man asks you if your in a hurry answer "no" and after he explaines how to catch a weedle fly to fuschia
city go south and surf to Seafoam islands.then when you get there surf up and down the beach until you run into "M" kill it or run away but don't catch it then afetr the battle check your sixth slot and it should have a weird marking and a 9 next to it.Instead of having to do this all over again you can just switch the item you want multiplyed and surf up and down the beach until "M" Or Missingno Appears.

(On your first trip to Cerulean, without the use of a cheating device)
Catch a JIGGLYPUFF in Route 3.
Level up JIGGLYPUFF or evolve it with a Moon Stone so it's speed stat is at least 25.(Do not delete Sing!)
Using JIGGLYPUFF'S Sing, capture an ABRA in Route 24.
Make sure you do not battle the trainer in this patch of grass. You will need him later!
Now, go down and immediately press start.Select Abra, and Teleport.
When you warp back to the Pokemon Center, your start botton will be disabled.
Just head North across Nugget Brigde.And defeat this trainer. He will have a level 17 Slowpoke.
After you do that, your start button will be enable again, so teleport one more time.Now head North like last time.
Your game will pause here, so press B, and then get ready for action!.And there he is, no cheating devices or anything...

Perform the Mew cheat where you fly away from the gambler and then beat another trainer then go to a ditto and let it transform into a Pokemon that has a special stat of 255 then fly away as you usually would (go to lavender) now walkleft and you will encounter a glitch trainer who sends out a 'm' that looks like a charizard (note you can't catch it) and it has loads of wierd side effects which can overall change your name,turn some of your team members into bulbasaurs, change stats (not all bad as it can raise them over 999!),give them status changes that can't be healed, change there move set (sometimes teaches them moves they can't normally learn)and lastly distort the image. All hail the almighty 'm' and it's charizard form!

First, you need a gameshark. Enter this code in:
01C164D1
That will turn your first Pokemon into a glitch pokemon. It will have everything your first Pokemon had, except the pokedex number. It will say, in the stats, #205. Yay! Glitch pokemon!