its a couple suggestions but all about bugs!
1st is a bug surf mount could be a surskit seems simple enough
2nd is Cutiefly its only spawn location is in the bug catching contest so its rare to ever see them around just throw one down in an event like summer i think it would be healthy for the game to have more mons around that arent seen often
3rd is shiny vivillion its exactly the same as its base form no different at all
4th is compound eyes as a glass cosmetic just reskin sableye to green or yellow
