added comp shiny exeggutor with pumpcat + comp shiny haxorus + a box of halloween 2023 dittos and some legendary beasts + shaymins with Halloween 2023 Particles (wont be able to get it again on those legendaries)
if you are underleveled you can also do saffron city first - there is no order in which you have to do them.
other than that psychic types do really well vs koga, for example a starmie
You are probably refering to the Bug that IS related to the reaper that Sometimes wont let you choose moves If He removed Mons from the field. Relogging fixes it