Pheromosa, fighting bug, germaphobe? Might see some use in a raid, but it’s pretty fragile for PvE, will go out fast. Not much use in PvP, but don’t you want one? Everybody needs that dex!
To beat a bug, it takes a bird, all the birds, any bird. Double super effective really makes flying the only reasonable counter, we just had that Starly Community Day, plenty of birds to go around!
Go to the official counters page for a complete list including Shadows and Megas to see how your Pokemon perform.