I feel like they could have easily used Flygon instead of Garchmp here. It has the same type and similar attacks and the addition of Dragon Dance. Sure, it has lower stats all across the board but at least it fits. Levitate could also make it a safe switch in to her Excadrill and Nidoking's Ground weaknesses. Swampert could be a good reason to reference mudkipz, but Amaria already has one if you battle her in singles