https://pokepast.es/0715f4b8125f25c1

This should be pretty simple/straightforward.
Turn 1: everyone breaking swipe
Turn 2: everyone breaking swipe
Turn 3: everyone acid spray
turn 4: Tera, dragon cheer/skitter smack/sludge bomb
Turn 5+: Sludge Bomb
Turn x: whenever it resets it's own stats, do turn 2 and turn 3 again, then resume turn 5+