Little Cup Rules:
Pokémon: Players are allowed a team of up to 6 Pokémon that meet the following
conditions:
- The Pokémon must be able to evolve.
- The Pokémon must be the earliest evolution stage obtainable.
- The Pokémon must be at Level 5.
- The Pokémon must not be on the Ubers list.
- Species Clause - Only one Pokémon may be on a team from each species.
Ubers - The following are banned from use in Little Cup:
Scyther
Yanma
Sneasel
Meditite
Misdreavus
Murkrow
Tangela
Items and Moves:
Items: Pokémon in Little Cup are allowed to hold items, as in any Pokémon match. The "Item Clause" is not in effect in Little Cup, multiple teammates can hold the same item. The items Deepseatooth and Berry Juice are banned.
Moves: Pokémon in Little Cup can use (nearly) any move available to them at Level 5. All non-genderless Pokemon can use their level-up moves, and genderless Pokemon can use any 3rd generation level-up move in conjunction with any TMs. Sonicboom and Dragon Rage are both banned moves. Further information on illegal move combinations is located here.
OHKO Clause - Moves that score a guaranteed "One-hit-KO" on the opponent, such as Sheer Cold, Horn Drill, Guillotine, or Fissure, are banned.
Evasion Clause - Moves that directly increase a users Evasion such as Double Team and Minimize are banned.
Battle Mechanics:
Sleep Clause - Only one Pokémon can be put to sleep by an opponent at a time, per team.
Self-KO Clause - If an opponent uses Selfdestruct or Explosion with their last Pokémon, they lose the game regardless of the number of Pokémon remaining on the other team.
Evasion Clause - Moves that boost evasion (i.e. Double Team and Minimize) are not allowed.
EVs: Contrary to some beliefs, it has been proven that even with a level 5 baby, any EV spread is possible on any Pokémon by way of the "Box trick". Thus, the standard in game maximum of 255 EVs per stat, 510 EVs total is the only limitation on EVs in Little Cup.
From Smogon
P.S. I have copied from Smogon directly( is that allowed? ; if not, please let me know)
