Caddywompus
Member
I thought Kyogre was the answer too at first. He was on my first successful team. But then I realized it's all in the chains right after the two columns fall and making sure disruptions don't hinder all that open space just created. Really the team didn't seem to matter as long as you got a few nice chains and managed to evolve around turns 16-20.It may have just been luck of the draw, but I couldn't get regirock below about 1/4 HP without items.
Edit: Also looking at your teams, I think I may have not optimized abilities as effectively as I could have.