There is a fan-created pokemon, in a fan hack... but there is no legitimate pokemon in any real pokemon game called that.
There's no Pokemon called mewthree.
no
Mewthree is fake, REPEAT MEWTHREE IS FAKE >_<
There is no such thing as Mewthree.
There is no Mewthree
There is no Mewthree period
go to google images, and then type in mewthree/mewthree x
There isn't a "Mewthree cheat", since Mewthree doesn't exist.
i don't now how to in diamond but................. there is this game called Pokemon chaos black it is a hacked version of leaf green and fire red you can get mewthree and mewthree x on it WITHOUT AN AR CODE!!!!!!!!!!!!
There is no such thing as a Mewthree.
You can not get a mewthree without hacking into the system.
There is no such Pokemon as Mewthree.