Liar. I have to get to 50 wins at Battle Maison, but it's rigged after 40. They start throwing legendaries in your face with items like Bright Powder and I never know which ones they're going to use. I've gotten between 40-50 three times now and I always lose to a legendary team. I don't know what to do anymore. I use:

Greninja @ Focus Slash/Life Orb
Nature: Timid
Ability: Protean
5IVs (-ATK)
Moveset: Dark Pulse, Grass Knot, Surf, Ice Beam

Overall a good lead Pokemon. I usually start out with Life Orb in the first 30 rounds or so and switch to Focus Sash when the enemies start getting faster and tougher.

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Garchomp @ Garchompite
Nature: Jolly
Ability: Rough Skin
6IVs
Moveset: Dragon Claw, Fire Fang, Rock Slide, Earthquake

Garchomp helps a lot against electric types so that's mainly why I use him.

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Scizor @ Choice Band
Nature: Adamant
Ability: Technician
5IVs (-SP. ATK)
Moveset: Bullet Punch, Swords Dance, X-Scissor, U-Turn

Scizor always saves my ass against wall Pokemon that have the fewest weaknesses and from that pesky Weavile which is why I love him.

tl;dr I don't know what to do against these legends. My team was fine up until that point.