I don't know how creative this is, but Fire/Fighting Judgment on Mega Ray's 4th slot over its common coverage moves like Low Kick, Magma Storm and Precipice Blades makes Imposter easier to wall (at the cost of losing to Shedinja) and this way teambuilding it's easier as the Imposter is locked in a mono-Flying coverage so you just need a bulky Steel or Rock-type instead of a dedicated Flash Fire or Levitate wall.