It’s Buzzwole, the swole bug! The biggest splash it makes is in PvP, all leagues, but you’ll have to convince a new player to trade you one for great league! Not the best moves for PvE, but still, it’s a big bug.
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.