How do you clone your pokemon?

As far as I can remember you can't clone Pokemon here in this game. Only in G/C/S and Emerald.

I think you have to beat the Elite Four and go to one of those islands.then you take your Pokemon to a nursery or put them in a breeding crate.

No you can't clone your Pokemon here

Nooblets you CAN (!!) clone Pokemon in red. You use the same method for yellow and blu also:
1. Put the Pokemon you want to clone in a pc box
2. Exit the pc
3. Save
4. When it asks you to save, say yes
5. When it says Now saving, turn it off (;D)
6. Turn on you're game. Check you're party and then the box. I havent played in ages so it might not work.
When it saves give it a second then turn off; don't do it immediately.

If you give a Pokemon an item eg Masterball you can clone that to I think
Test it frst with a weedle or something crappy to make sure it works; don't try o clone your masterball then it turns out to f**k up your game.
Happy Cloning!
--Basthanszic

I don't know how old this post is. Cloning was possible in R/B/Y BECAUSE of interuptions in the save process. There is a lot of online literature for it nowadays on wiki.

You can NOT clone Pokemon on red/blue/ýellew, because there is no "move pokemon" option, only deposit and withdraw. Therefore your party Pokemon and box Pokemon can't be viewed in one menu, so the transision is directly done, and not still in progres when you turn off the power halfway the saving proces. I've just tried it, it doesnt work.
Alas

Most complicated way ever but is possible but not through rby you have to Trade your Pokemon to gsc then clone them thee and without changing the Pokemon moves give one back to ryb no items on the Pokemon and it is a way to get unattainable Pokemon in your gold silver crystal (ie mewtwo) and not loose them.

I did this for years and also just now (cloning Mew) it works fine for me on red. I have found it only erases the Pokemon or (and most commonly) puts it back in my party if I get the timing wrong.

There is actually definitely a way to do it in R/B, not too sure if it works in Yellow, but it probably does, just assuming, bc I have Red AND Blue, two GBAs, and a link cable. It works by maniulating the saving processes during a trade, and turning it off at the right time. But I haven't done it since like 2005, so idk... But I DID perform it successfully, and also using the Mew Glitch to duplicate my Mew, so now, I have 5 Mews still XD! So, I'd experiment with it that way, and I've messed it up a couple of times, yeah, but it does NOT erase your save file. At worst, it'll delete both Pokemon in the trade. So I'd practice with it at first with a useless Pokemon, like Magikarp, or something. But you can look on this Bulbapedia link for more information! Thanks! http://bulbapedia.bulbagarden.net/wiki/Cloning_glitches#Trading_method

If I remember correctly you have to deposit the Pokemon to be cloned in to an empty box, then switch boxes again and turn off in the middle of saving. It definitely works because I remember cloning my charizard 6 times on red

Cloning in Pokemon red requires 2 systems. Initiate a Trade between 2 copies and send over 1 pokemon. Afterwards before the 2nd Pokemon is sent, disrupt the connection. The first Pokemon will be on both games and the 2nd Pokemon will be no more. (It will be deleted)