You can't
No. It is a fake pokemon.
there is no mewthree
There's no Pokemon called mewthree.
They haven't made a Mewthree yet.
You cannot. Mewthree only exists as a fan hack.
Sorry, mewthree is fake. You're out of luck.
Mewthree doesn't exist.
You can't
No, Mewthree cannot be caught in Pokemon Pearl, because it never existed in the game. You would have to import Mewthree into the ROM to be able to catch it.
Mewthree is a fake rumor. So, you can't catch it.
You cannot catch Mewthree in Pokémon Yellow. This fake Pokemon is only in hacked game chaosblack.it is inposible to get mewthree in leaf green. you can only get it in Pokemon chaos black.
Mewthree does not exist except as a fan hack, and isn't avalable to catch in any legitimate Pokemon games.
No. Mewthree is a fake Pokemon,sorry if Pokemon had a mewthree that would be awesome though.