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I've seen someone battle the Champion on a YT video, ♥♥♥♥ me that ♥♥♥♥ is hard. He keeps trying to stall out your PP with constant Hyper Potions and withdrawals.
It's ridiculous.
WOWOWOWOWOW, THIS HACK LOOKS AMAZING!!!
TBH using legendaries is kinda cheap so I avoid it. I used a Latios on my Liquid Crystal run but I shortly deposited it - I used it as a temp - when I found out I could catch Gengar in Lavender Town.