>>52644021remove fairy resist (possibly make it a SE vs fairy but neutral is a start, fairy was a mistake, making it just made dragon 2.0 and made weak types weaker for no reason..)
The thing is bug has good moves, U-turn, X scissor, Pollen Puff (why is it even a bug move when more grass mons get it btw...) Rage powder (again why is it bug?), First impression, Bug Buzz, Leech Life, they have a decent movepool, they just need to be able to access it more.
A big problem is their weaknesses and resistors are so fucking common and strong, but also according to bulbapedia, bugs have the worst hp stat of all types on average, so making them a bit beefier would be a decent start.
I also never understood why bug and fighting resist each other personally?
But If i had to fix it, I would give them more abilites that made them fill the roles better.
bugs with Orthworms new ability Earth eater, give some of them intimidate (lots of bugs make patterns on their bodies to scare predators), poison touch/poison point. Fuck it give them a move that is average power normally (50~55), but if the target uses a priority move/prankster move (of any kind, fuck prankster tailwind) you attack before the target, and the moves power is doubled.