Since this thread is full of retards, I'll make an objective overview and review of each option so you fuckmonkeys can make an informed decision on which to choose.
Mawile
>nice home life with Diantha
>get spayed
Rating: 6/10, pretty comfy
Ponyta
>get humped by Dawn
>forced to partake in contests
Rating: 7/10, worth it
Meowstic aka "Pussy Wrecker"
>get to be a badass cat
>fuck bitches all day
Rating: 8/10, hell yeah mother fucker
Flygon
>good at battling
>no gf
>no mega
>pic related is my face when you choose Flygon
Rating: 4/10, feels bad man
Slowbro
>smart
>funbro is hell
Rating: 0/10, masochists only
Archeops
>center of a cult, feared and worshipped
>peak physical condition
>stylin' as fuck
>demi-god powers
>bros with Entei and Eusine
>nearly no downside
Rating: 10/10, no reason to pick anything else