>>53737231Damselfly Yanma with a regional evolution (maybe female only?). Fast (~130 speed), VERY frail, slightly better special attack and slightly worse physical attack than Yanmega. No type change, but it does get limited Water-type coverage. Basically just a very good revenge killer/lategame cleaner. You bring it in to take out something nasty, you get the Speed Boost amp after, and you try to keep up the momentum until something kills it or you win.
I don't know why it would evolve these traits. I'm not an entomologist.