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You can use hidden power grass from a physical sweeper such as dragon dance tyranitar or agility metagross to weaken swampert, which is a physical wall that can prevent either physical attacker from sweeping.
You've got the beginnings of a strong offense team here but it probably needs more refining. I'd recommend choosing either ddtar or agiligross as a win condition to build around and modifying the other to wallbreak for it with hp grass.