General Battle Rules:
Species Clause: A player cannot have two (2) of the same species of Pokemon on their team, based on National Pokedex Number. For example, a player cannot have two Koffings on their team.
Sleep Clause: A player cannot put two or more different opposing Pokemon to sleep using attacks that induce sleep to opposing Pokemon.
Evasion Clause: A player cannot increase their Pokemon's evasion stat with a move that specifically increases evasion. Items or indirect boosts do not break this clause.
OHKO Clause: A player cannot use a move that has a chance of instantly KOing an opposing Pokemon. For example, Horn Drill or Sheer Cold are illegal moves.
Self-KO Clause: If a player uses a recoil move to cause a draw, that player wins. If a player uses Explosion, Selfdestruct, Destiny Bond, or Perish Song to cause a draw, that player loses. If a draw would be caused by a hold item or ability that causes recoil to the opponent, the player that controls the Pokémon with the hold item or ability wins. (This clause helps determine the winner of what would be called a tie in DPP. Later generations do not apply this clause, because their cartridge mechanics will prevent ties from happening.)
Endless Battle Clause: A player cannot use a combination of items / moves / abilities to force a game that will never end (example: Recycle / Leppa Berry / Heal Pulse, etc).
Moody Clause: A player can not use the ability Moody.
