If you could own any Pokemon as a pet, which would you choose?

Squirtle!!

Dear Roy Roy,

That is SO easy, because I only know one Pokémon, and that is Pikachu! My god daughter loved him when she was small, along with rainbows and unicorns, which I love also, so I figure Pikachu must be indeed quite wonderful! (Seems like I recall Pikachu can transform into other versions or something?)

Is there a Pokemon called Ratfink? If so, I want one of them.

Vaporeon