I made the table, I want to add a few clarifications:
- Basculin Pink is speculation, but Basculin got trademarked in August, Stantler didn't, it doesn't make sense for a Ghost type to evolve into Basculegion, which by the way has elements of both Basculin forms, I think we could get a third form, a mix between the two, one school, no infighting, you get it
- Qwilfish could be any permutation of the Dark type (riddle mentions an evil smile), the Ice type (Inkay - Clobbopus - Eelektrik) and the Poison type (it loses Water for sure)
- A list that included everything else I included was shared with the riddler, who said it's not accurate. Since almost everything was shared by him, it's either Goomy and/or Sliggoo or Sneasel who will not get regional forms.
- Grass/Electric is speculative, but PokéBalls are made of wood in this game.
- The Origin forms for the BDSP cover legends might not be real, but there has to be an Arceus form.