>>46241162Designate Xerneas as a Tank. Use its Sync Move, spam Horn Leech so it doesn't die. When Pinsir uses Toxic, use Sycamore's Trainer Move to get rid of it.
Use Swanna's Gust for quick Sync Pair charges, and her Potions for healing in dangerous situations.
Spam Psychic or Shadow Ball with Mewtwo and Sync Move their asses into oblivion.
I first took out all of the Center Pokémon, and then went for the Side Pokémon after.
An unlucky crit killed my run, sadly, so I had to take a second team into that stage, but it's 100% doable by Xerneas and Support.
Hang in there, you still got some time left.
