They won't. It is not a real pokemon.
No as mew three is a fan based creation
Mewthree is fake, REPEAT MEWTHREE IS FAKE >_<
There is no Mewthree period
There is no Mewthree
There is no such thing as Mewthree.
go to google images, and then type in mewthree/mewthree x
There isn't a "Mewthree cheat", since Mewthree doesn't exist.
There is no such Pokemon as Mewthree.
There is no such thing as a Mewthree.
You can not get a mewthree without hacking into the system.
Mewthree doesn't exist!
MewThree is %100 fake.