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New ways to evolve pokemon:
Season specific evolutions not forms like Deerling
Gender specific depending on both the pokemon and trainer sexes, f/f m/f m/m
Someone suggested birthday evolutions that devolve when traded
Min happiness, like frustration
Maybe not evolutions, but variations depending on the trainer outfit, like furfrou variations but based on trainer customization
More weather based evolutions; different evolutions depending on the weather
Mid battle evolutions would be sick
Evolutions based on status effects eg paralysis evolves to electric
More evolutions based on other party pokemon like pancham
More held items evolutions without having to trade; different evolutions based on the held item
More area specific evolutions
Key item evolutions like the gracidea flower
NPC induced Evolutions like specific move tutors
Bring back contest and contest evolutions like milotic
Progress dependent evolutions, number of badges/challenges completed
More unpredictable evolutions like wurmple
Nature specific evolutions, different natures give different evolutions
Healed item variants during battle, like lemonade/soda variants
If we get more options to change music like at the battle tree or even gsc music in hgss Expand can happen music dependent variations
Just more modes of evolving because that's yhe fun part