The Battle Maison is a bitch. I cleared the first singles challenge pretty easily, but I've got max speed EV Mons getting outspend by almost everything. My Azumarill is going to be an absolute monster once I build up to that Ability Capsule, and I need to put Grass Knot on my Greninja.
Planning on running it hard with this team:
Greninja - Timid
Ability - Protean
Grass Knot
Ice Beam
Dark Pulse
Scald
Charizard Y - Modest
Ability - Blaze
Solarbeam
Fire Blast
Focus Blast
Dragon Pulse
Garchomp - Jolly
Ability - Rough Skin
Crunch
Earthquake
Stone Edge
Dragon Claw
My downfall my first couple runs was a lack of items, lack of Grass Knot, and the horrific self-injury rate of confusion.
Damnit, I want those 100 and 200 win streak berries! They can make an item that's a double Rare Candy.