I'll try reproducing this in a later stream, but somehow my Sneasler failed to flinch a Mega Charizard Y with Fake Out (post-maintenance):
Turns were as follows (I was not actively recording my battle):
Turn 1: Floette + Dragapult into Charizard + Typhlosion-Hisui. I use non-Mega Protect and Outrage. Opponent uses Protect with Typhlosion and Mega Evolves + uses Heat Wave. Outrage hits into Protect, and Heat Wave hits into my Protect and hits Dragapult.
Turn 2: Floette Mega Evolves and uses Moonblast into Typhlosion, and Dragapult uses Dragon Darts, targeted at Typhlosion. Opponent uses double Heat Wave. Dragon Darts deals some damage to both. Heat Wave comes out, and one of them misses Floette.
Turn 3 is the clip.