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Sure you guys are aware of the various evolutionary methods in Pokemon, stuff like Levelling, Hapiness & Stone Evolutions (as a general concept, not the specific stones though) get a decent amount of representation each generation. But there are a considerable number of additional evolutionary methods that appear once (or twice if we're lucky) and then never crop up again.
What are some of these evolutionary methods you'd like to see make a return with new Pokemon either through entirely new Pokemon or as an evolution to an old Pokemon.
Pic related, I don't know why they didn't give Castform Weather dependant Evolutions after they introduced Sliggoo -> Goodra, I think Castform should get Evos for each of the four major weathers and each should be able to activate that weather effect through its ability (Drizzle, Drought, Snow Warning & Sand Stream).