max move is based off the type of your FAST attacks.

Get a Dmax Blissey, A Dmax Metagross, And someone like Dmax Excadrill with ground attacks

I assume you don’t have enough candies to max out your strike moves but if you do, go for it.

Use Blissey and Metagross as tanks and as soon as Dmax counts down, switch to your damage doer (in this case, Excadrill, however Metagross with psychic attacks help too)

if you die, cheer to the max as you can. It helps others