Ursus Astrorum said:
Correction: Seemingly weak. I know for a fact that Espeon can utterly destroy Groudon just by blinking (Read: One-shot with psychic from twenty levels below the legendary). I was switching to the "cute things killing gods" to cover things from a non-IRL standpoint as well.
You seem to forget that the slightly more colorful weasels and rabbits can control a multitude of powers with just as much deadly efficiency when raised and trained correctly, whereas deities would probably just step on/eat any random human who assumed they had control of them. And let's not get started on what they'd do after they decided you were an ungrateful douche for ordering them about. We folks with cute poster pokemon can't go cleaning up you "It's awesome and therefore I must have it" type's messes all the time, you know.
Also, where do you plan on keeping these monstrosities exactly?
I guarantee you that your Espeon couldn't come close to defeating a trained legendary or pseudo-legendary unless using a gimmick build. Defeating wild legendaries, or even the Elite Four's pseudos isn't proof of power. My Scizor walked through 4 versions of the Elite Four (Diamond, Platinum, and both of Soul Silver's) using a grand total of two moves.
Weaker Pokémon are weaker due to their stat differences. Are you assuming that a well trained Espeon will outdo an equally trained Mewtwo of the same level? Your "cuter" Pokémon (seeing as you liked Buizel and Lopunny, I use that term very loosely) couldn't fight their way out of a paper bag.
Just because I prefer useful, sentient, unusual Pokémon to weak, barely-different-from-real-life-equivalents means I'd order them around? I'd do what any proper person would do if given a Pokémon in real life, have it as some kind of useful friend.
Having a small rodent that can spit water is great, but not when the alternative is an intelligent, psychic robotic tank-thing. Or a dragon. Or a humanoid metal bug.
As for keeping them, Giratina or Dialga would simply enter their own pocket dimension when not going somewhere or not needed. Scizor would stay in my house, since he's humanoid and reasonably sized. Rayquaza would fly in the atmosphere as it normally does, and Darkrai would probably just float around my area destroying people's psyches.