Did ya miss gen V?
It was heavier bug infested than any other generation to date, and added quite a few exotic ones, like
and added more of the uncommon combos like
along with making the Bug/Steel combo into the most common by adding Escavalier, Durant and Genesect...if they didn't also add a fifth Poison one, Scolipede, but at least this one is more than a joke.
Even one that stays pure to the final stage, Accelgor.
Which is 9 lines, or 18 pokemon (compared to 12,10,14,9), including the first Bug legendary!
So yeah... but that's not to say there aren't a few exotic combinations left (theres many less diverse though..), and if thats what you actually meant, I agree that there should be some of these asap:
-Bug/Dark (like obvious replacement for the poison ones)
-Bug/Psychic (this really doesnt exist yet wtf)
-Bug/Water (F*ck Surskit.)
theres Bug/Ice too, but that would require some worthy concept..