Sucker Punch/Focus Blast Gengar

Yes he will make mincemeat of a Ursaring with a double fight moveset !!!

I caught a gengar with this moveset once. To my surprise the app insisted on suggesting him when there are normaltypes in a gym.
Suckerpunch, unlike his other quickmoves, is not resisted by normaltypes while Focusblast deals SE damage. It works best against p/hb Blissey, but there are better options.

For the record. The best opponent for a SuckerPunch/FocucBlast Gengar would be IMO a Counter/FocusBlast Ursaring
Gengar has double resistance against fighting moves and Ursaring is nuetral against SuckerPunch and weak against FocusBlast.
Against a P/HB Blissey he would only have single resistance ,not bouble resistance and resistance is very important when using a Gengar

Gengar has .36414 resistance against fighting moves vs .51 resistance against normal moves. You do the math