Lost at 511. Trick room, both leads could've set it up so it was a coinflip that I lost to kill the right one. I'll do a full writeup and consolidate my thoughts and update the post linked in the OP at some point. Maybe I'll continue on with Whimsicott, Uxie, and Drapion now, but they are so SLOW. Or time to try something else.
I like the scarf Smeargle idea, I may try something similar next. Anyone try abusing Mummy with Slaking/Regigigas yet? Or using evolite? And new weather options this gen. So many things to try.