MUAHAHAHAHAHA
Mmm, that event was really cool. Well, any event involving ghosties in this game tends to deliver. Oh, now I want to grind up the ghosties I have and do a monotype from here on out...
As for beating her, I was a jerk and used the same Focus Band + Curse strategy I used to beat yer man and his Garchomp. I wouldn't be too confident with the Luxray and Gyarados; HJK coming from a Medicham should still destroy Luxray even after Intimidate, and it has Thunderpunch for Gyarados. Well, you could still always try for a miss with HJK, but I seem to remember it being high level so even that might not be enough. I guess spamming the battle until you get two misses wouldn't take that long, though. See how you fare.