I made a Mega Pidgeot specifically for this fight. Tailwind/Heat wave (move tutor at peridot ward)/ Hurricane/ Sunny Day
1-Set up Tailwind turn one (you need to make sure the galvantula doesnt kill the Pidegot though, I recommend Lycanrock Accelrock Choice band)
2- Sunny day turn 2. Now you outspeed the Chloroform users
3-Heat wave spam with Tailwind+Sunny Day+Help from the other mon should do it