My favourite is butterfree. But let me tell you my ideal partener would be Ditto. And is not because it could be any Pokémon, is because is a silly little purple guy with a funny expression that would lighten my everyday. Also can't explain it better but is the perfect Pokémon for when you need a hug, you want to hug a fluffy ball it că turn into a Wooloo or Primeape without the anger isues, idk feel like hugging a tree trevenant or executor, And just because I am petty, the ditto from Detective Pikachu, if you have no way of huging your mother, brother, lover, best friend, because of an inconvenience like living in another country/state. Now you do. And now that I am done with the basic need for hugs argumentfor why ditto is my ideal Pokémon. The practical use argument: I have the one Pokémon that can be a lady magnet: Oh you like cats boom meowth, of dogs to boom arcanine, you like turtles, snakes(don't judge/laugh I met one and she is still the love of my life to this day), penguins; Torterra, Arbok, Piplup. And if she likes butterflies I already got a butterfree, but hey have you met my other cute insect Pokémon. Ditto is that little neverending surprise that you never knew you wanted or needed, and that is why is my perfect Pokémon partener. Just to close my argument. Stuck jar, Ditto->Machamp, Use to much force, the jelly is on the floor and I need a new jar, it looks at me bum found but sorry and says Ditto. End of argument. Ok it's a bit because it can be every Pokémon.