Flygon EQ / Fire blast / Rock slide / Hp bug is pretty good with spikes, i use it quite a bit with swampert because the "electric with hidden power ice/grass" like raikou or zapdos are easily covered, and it's good to have a back-up check to CBAero / DDttar because Swampert needs to tank way too much shit to stay alive.
Sadly P2 / bold cune / Gengar / Swampert are really good check and they are pretty common so it's hard to pull through, but with spikes in lategame he is pretty darn good imo.
CBgon is fun to "revenge kill" a weaken offensive cune and to be pretty scary against offense, and he is quite good with restalk magneton for skarmory / fire punch-less gengar
Sadly P2 / bold cune / Gengar / Swampert are really good check and they are pretty common so it's hard to pull through, but with spikes in lategame he is pretty darn good imo.
CBgon is fun to "revenge kill" a weaken offensive cune and to be pretty scary against offense, and he is quite good with restalk magneton for skarmory / fire punch-less gengar