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You have to start out with a Pokemon unlisted on the SM OU viability rankings. You can make up new moves and abilities, but if it is banworthy, you lose. It also has to mega evolve via held mega stone, and can only gain +100 bst.
No Slaking, Archeops, or Regigigas, and restrain your urge to Huge Power or go full MegaBee unless there's literally no other way to save the shitmon.
