Have you tried fake tears on Whimsicott?
- 252 SpA Mega Charizard Y Overheat vs. -2 0 HP / 4 SpD Mega Charizard Y in Sun: 170-201 (111.1 - 131.3%) -- guaranteed OHKO
Helps you win the mirror match, but also net some other nicely unexpected OHKOs:
- 252 SpA Mega Charizard Y Overheat vs. -2 252...