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Hell yes, I did it. I got every single trophy in the Battle Maison. At first I didn't want to try the Multi Battle but after looking though the AI Partners I got I decided to give it a try. My partner used Gengar (just like me during the Super Doubles) and Crobat.
I basically used the same team I bringto the Battle Tower since Gen 4. Sashed Gengar with Destiny Bond and Garchomp, my third Pokémon was a Multiscale Dragonite a friend gave me though this time. While I wanted to use them for Singles only at first I soon realized they are even better in Doubles and Triples which I beat on the first and second try respectively (Singles took me five tries). Filler Pokémon were the event Blaziken (with Life Orb or Megastone), a Scizor another friend gave to me and Blastoise which I used during the story. Besides of Blaziken the other Pokémon are pretty much filler.
Nevertheless I think I'll post some vids I made:
>DNEW-WWWW-WWW2-9SBL
The Super Multi Battle Bosses. It's funny that you get to fight Nita and Morgan here while you fight Evelyn and Dana before attempting the Super Multi. My partner was no help here so I mindlessly spammed Outrage because it actually works. Keep in mind though that you cannot choose which Pokémon you'll target when using it so I probably was kinda lucky here.
2XCG-WWWW-WWWX-SLN6
Super Doubles, also some Evelyn dropping her spagetti for you in the end. I expected High Jump Kick to miss at the end to be honest, I think Flame Blitz would have knocked him out, too.
>JV9W-WWWW-WWWX-SLZ7
One Triple Battle with Legendaries. Not the last battle but definitely more interesting. I forgot to save the battle with Dana anyway.