If you could add 1 regional variant of an existing pokémon evolutionary line to gen 10, what would you choose?

Honestly I'm just curious about how creative people can get. For instance, if I could choose one I would probably go for an ice ponyta that can evolve into three kinds of rapidash:

  • Unicorn form (ice)
  • Pegasus form (ice/flying (requires it to know at least 1 flying type move))
  • Alicorn form (ice/flying (requires it to know at least 1 flying type move and have a hidden ability))

Either that or the pink butterfree so we can finally have an answer where it came from.