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I don't really think that's something you'd get to choose unless you were literally asked while going between worlds ala the MC of the games, but, if I had the choice then Mawile, no question.
>good typing
>2 hands, 2 legs, 2 mouths
>mega evolution
>""deceiver"" pokemon
The real bonus would be using the extra mouth as storage, I could smuggle items or small Pokemon or something, that'd be fun.