Quick, claim what pokemon you would have in real life. Let's just pretend accommodations/expenses for feeding and the like are covered, so you can pick w/e.

Starting with the best choice
>Lion+dog=perfect for cat or dog people
>pokemon so implied near human intelligence i.e. you won't have to worry about cleaning flaming shits off your living room floor
>gigantic and fluffy
>loyal to a T
Arcanine a best pet/bud