Sabriel's suggestion for dealing with Chamise and her cubit is to get onto Cuddles the Gaslord, and any other flying cubits, and deal with Chamise directly- or at least, take out those energy reins she's using to steer the legendary cubit.

And then, instead of fighting the legendary cubit, talk to it. Sabriel can understand ghost types, so she'd be happy to let her cubits act as translators so the crew can talk down what is probably a frightened, lonely alien who just wants to go home, avoiding an unnecessary fight. (And maybe try to heal any damage Chamise inflicted with magic).