Rules: Players take turns naming a Pokemon, Move, or Ability. This continues until each player has named (WLOG) 12 game objects in this way.
Then, players battle one another. Before each battle, players prepare Pokemon teams according to the rules of Balanced Hackmons, without using any Pokemon, Moves, or Abilities their opponents drafted. In other words, they can use anything they drafted in combination with anything nobody drafted.
Bans: Normal bans in BH, minus at least Shedinja because I'm not a coward the draft format alleviates the oblique force Shedinja puts on the format.
Special Rule: Nobody can draft Imposter. Anyone can have an Imposter on their team (although if someone else drafted Chansey, they'll have to put it on a different health-blob).