Dude how do you get mewtwo on leafgreen plz help me ps don't submit cheats..

Mewtwo is located in Cerulean Cave. You need to Surf there - it's just north of Cerulean City.

However, you cannot gain access to the cave until very late in the game. In order to gain access to the cave, you must:

1. Defeat the Elite Four and the Champion once.
2. Obtain the Ruby and Sapphire gems in the Sevii Islands and give them to Celio on One Island. This quest also involves you driving Team Rocket out of the Sevii Islands.
3. I'm not sure about this, but you may have to defeat the Elite Four a second time after the Sevii Islands quest (at which point they will be more powerful than previously).

Once you have done this, the man standing at the entrance of the Cerulean Cave will disappear and you can enter.

When you encounter Mewtwo deep inside the cave, he will be at level 70. In order to catch him, there are two possible methods:

1. Use the Master Ball. This is the easiest method, but I recommend you save the Master Ball for catching the legendary dog instead as they are an even bigger pain to catch.

2. Try to lower Mewtwo's HP to as low as you possibly can (the attack False Swipe is particularly effective in lowering his HP to 1). Paralysing, freezing or putting him to sleep also help out (paralysing is the best option as it does not naturally wear out), although avoid poisoning or burning him because he'll die at some point if you do. Once you are stisfied with his remaining HP and his status, start using Ultra Balls. This might take some time, so I recommend you pack at least twenty. However, I recommend this method, as it allows you to save your Master Ball for whichever legendary dog you will be encountering.

Best of luck.

To get Mewtwo you have to finish the Pokemon league then go to cerulean cave. There will be lots of Pokemon over level 50 so bring lots of hyper potions and your best pokemon. You have to progress through the cave until you will see Mewtwo there. Bring lots of ultra balls and other pokeballs.

Thanks for reading...
^^
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Mewtwo is in the Cerulean Cave at the top of Cerulean City (the second city) in the game.

There's an old man blocking the entrance and he will only be gone once you defeat the Elite Four and retrieve two items from the Sevii Islands to give to a guy who needs them to build a new invention.

Mewtwo is level 70. I caught him personally with around 12 ultra balls. Once you get his health on red start firing in the ultra balls. If you have a Pokemon who can cause a status problem to Mewtwo then use him as Pokemon with status problems are far more easier to catch.

You must go through the cave by the town where you met Misty. Mewtwo is at the end of the cave.

You have to beat the elite four, complete the Island tasks then defeat the elite four again. The go to cerulean city and go past the bridge and to the left and surf down, to find a cave.. He is at the end.

for somhe reason i caught him with one pokeball

go to cerulean cave (u need lots of ultra balls or 1 master ball and a pokemon with surf)

First, beat the Elite Four and take the ferry to One Island. Talk to Celio and he'll say something about the Ruby. Go to Mt. Ember and fight the two Rockets, go into the cave and get to the bottom floor. Pick up the red gem, go back, and give it to Celio. Then head to Icefall Cave (Four Island) if you haven't, get HM waterfall, and beat the grunts harassing Lorelei. Go to Six Island, surf down to Ruin Valley, and walk around until you find a cave with a steel door. Use Cut to open it. Then go down the middle, up, left, down, and right holes. Try picking up the blue gem, and a scientist will take it. Go to the Rocket Warehouse (Five Island) and beat the Rockets. Then get the Sapphire, hand it to Celio, and go to Cerulean Cave. Try ladder combinations and sooner or later you will find Mewtwo. Use your Master Ball if you want, or save it for your legendary dog.