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I've always loved the Clefairy line because of their cool space theme and cute waving their arms metronome motion. It would also be a good partner for normal life because it is a small, gentle Pokémon.
Then they got fairy and clefable got a lot of spotlight and became a lot more fun to use.
Rotom would also be a really good bro, but I don't know what to think of him after gen 7.