From the Unova Region:
* Reshiram: The White Dragon Pokémon, a powerful fire-type Legendary. You will obtain Reshiram if you chose to play Pokémon Black.
* Zekrom: The Black Dragon Pokémon, a powerful dragon/electric-type Legendary. You will obtain Zekrom if you chose to play Pokémon White.
* Victini: The Victory Pokémon, a powerful fire/psychic-type Legendary. You will receive Victini by linking Pokémon Black or White with Pokémon Black 2 or White 2.
* Cobalion: The Iron Will Pokémon, a powerful steel/fighting-type Legendary. You will encounter Cobalion in the game, along with its counterparts.
* Terrakion: The Justice Pokémon, a powerful rock/fighting-type Legendary. You will encounter Terrakion in the game, along with its counterparts.
* Virizion: The Blade Pokémon, a powerful grass/fighting-type Legendary. You will encounter Virizion in the game, along with its counterparts.
* Landorus: The Abundance Pokémon, a powerful ground/flying-type Legendary. You will encounter Landorus in the game, along with its counterparts.
* Thundurus: The Bolt Pokémon, a powerful electric/flying-type Legendary. You will encounter Thundurus in the game, along with its counterparts.
* Tornadus: The Cyclone Pokémon, a powerful flying-type Legendary. You will encounter Tornadus in the game, along with its counterparts.
* Keldeo: The Colt Pokémon, a powerful water/fighting-type Legendary. You will encounter Keldeo in the game, along with its counterparts.
From Other Regions:
* Mewtwo: The Genetic Pokémon, a powerful psychic-type Legendary. You will encounter Mewtwo in the game, but not in the main story.
Important Note: You can only obtain one of Reshiram or Zekrom depending on your game version. You need to trade with someone who has the opposite version to get both.