I was setting up a randomizer for sun to see if that could make it more fun (it didn't) and I noticed the evolution editor in pk3ds. Looking around I noticed thanks to Eevee, every Pokemon had 8 different evolution methods to work with.

That got me thinking, What if Pokemon evolved more like digimon?

So each Pokemon would have its normal evolutions, but then with other items or methods, they could evolve into an entirely different Pokemon.

Like Pichu evolves into Pikachu via happiness, but then could also evolve into Dedenne if it knows a fairy type move and reaches 50 affection.

Would anyone want to play that? I wouldn't balance movepools or anything like that, and Pokemon obviously keep their current moves after evolving, so you could end up with some hilarious Pokemon.