ITT, what were your pokemon that helped you get to the Champion's round and beat it? I kept switching around these guys;

DynamicPunch Machamp - Gilgamesh
Curse Snorlax - Crunchy
Modest-Scarfed Hydreigon - Cyber-End
Jolly Excadrill
Curse Swampert - Mudster
Sleep Talk Suicune - Xaliaphous

It's a pity Curse Snorlax isn't as good as he once was. I ended up winning the Champion set with Machamp, Hydreigon and my Swampert. My heart sunk when I faced Milotic, which I love to hate, but luckily it's Rest made for an easy turn to use Curse and Earthquake it away with Mudster. Finally, a quick way to net Battle Points, at least in the World set!

Yeah...
The team I built to challenge myself was really only usable because Revival Herbs exist. I'm probably going to do a second playthrough with competitive 'mons eventually so I can actually stand a chance. Not even my best old team members pack enough punch. You'd think that a Guts Swellow with Facade, Protect and a Flame Orb would be good enough.

I made a much better team and, after many attempts, won the Champions Tournament! I used the Crown Beast Raikou, the shiny Garchomp I trained up from the Gible that Benga gies you, and the Red Gyarados from SoulSilver. My other party members were Defense Form Deoxys, Genesect, and a Shiny Emboar (the one I hatched).