>>37965887no ice types until late game
not adjusting trade-only pokemon to evolve by some other mechanic (and not having an npc relay this change)
possibly buffing shitmons stats and/or changing up the HM/TM list
also consider importing the physical/ special split and fairy mods
one thing I was doing on my own before I'm massively incompetent at making sprites and moding games was a game set in the region that was exclusive to the trading card game where pokemon would have their types changed or one of their types
switched.It was a fun concept to work with that would later be made canon with regional forms years later.
Something to potentially consider adding some spice to your game, though it's likely you'd want to at least adjust their colors to match their new typings if you did go this route.