The simulator is here, and I generally play with OU rules, so over 95% of pokemon are legal.OU rules:
Spoiler: show
Play Restrictions
Endless Battle Clause: Any moveset on any Pokémon that is capable of intentionally causing an endless battle is banned from competitive play. Thus:
A Pokémon may not carry Recycle and hold a Leppa Berry in conjunction with Heal Pulse and Milk Drink, Moonlight, Morning Sun, Recover, Roost, Slack Off, Soft-Boiled, or Wish.
A Pokémon may not hold a Leppa Berry and carry Recycle and Pain Split on its moveset.
A Pokémon may not hold a Leppa Berry and carry Recycle and Fling on its moveset.
Evasion Clause: The moves Double Team and Minimize, in addition to the abilities Sand Veil and Snow Cloak, are not permitted in play.
Moody Clause: Pokémon with the ability Moody are not permitted.
OHKO Clause: A Pokemon may not have the moves Fissure, Guillotine, Horn Drill, or Sheer Cold in its moveset.
Sleep Clause: Only one Pokémon may be put to sleep on the opposing team at a time, if not induced by a move such as Rest.
Species Clause: Players cannot have two Pokémon with the same Pokédex number on the same team.
Pokémon may be up to level 100.
Banned Pokémon
Arceus
Blaziken
Darkrai
Deoxys
Deoxys-A
Dialga
Giratina
Giratina-O
Groudon
Ho-Oh
Kyogre
Kyurem-W
Lugia
Mewtwo
Palkia
Rayquaza
Reshiram
Shaymin-S
Xerneas
Yvletal
Zekrom
Banned Items
Gengarite
Kangaskhanite
Endless Battle Clause: Any moveset on any Pokémon that is capable of intentionally causing an endless battle is banned from competitive play. Thus:
A Pokémon may not carry Recycle and hold a Leppa Berry in conjunction with Heal Pulse and Milk Drink, Moonlight, Morning Sun, Recover, Roost, Slack Off, Soft-Boiled, or Wish.
A Pokémon may not hold a Leppa Berry and carry Recycle and Pain Split on its moveset.
A Pokémon may not hold a Leppa Berry and carry Recycle and Fling on its moveset.
Evasion Clause: The moves Double Team and Minimize, in addition to the abilities Sand Veil and Snow Cloak, are not permitted in play.
Moody Clause: Pokémon with the ability Moody are not permitted.
OHKO Clause: A Pokemon may not have the moves Fissure, Guillotine, Horn Drill, or Sheer Cold in its moveset.
Sleep Clause: Only one Pokémon may be put to sleep on the opposing team at a time, if not induced by a move such as Rest.
Species Clause: Players cannot have two Pokémon with the same Pokédex number on the same team.
Pokémon may be up to level 100.
Banned Pokémon
Arceus
Blaziken
Darkrai
Deoxys
Deoxys-A
Dialga
Giratina
Giratina-O
Groudon
Ho-Oh
Kyogre
Kyurem-W
Lugia
Mewtwo
Palkia
Rayquaza
Reshiram
Shaymin-S
Xerneas
Yvletal
Zekrom
Banned Items
Gengarite
Kangaskhanite
