u can defeat him with the mons with you and those in the pc. Start with noivern make it hold focus sash or quick claw set up tailwind and make it learn acrobatics if you can. Then switch into galvantula to set up sticky web and at this point your team should be able to outspeed all of the opposing mons. You should also teach your delphox will o wisp any way you can it is going to help you a lot. Also switching out drifblim for gothorita also seems like a smart play because drifblim doesnt have any flying type moves. Using emboar also seems like a good idea as long as it has very good hard hitting physical moves which affects the field. Switching out mismagius seems like a viable option for bringing in emboar unless it threatens your team's total synergy. Yeah all the best coming from a guy who has almost finished the game and is stuck on the crystal puzzle with serra in the postgame.
