Pokémon Black and White (and their sequels):
* Victini: This Psychic/Fire-type legendary is a mascot for these games, obtainable through an event.
* Reshiram: This Dragon/Fire-type legendary is exclusive to Pokémon Black.
* Zekrom: This Dragon/Electric-type legendary is exclusive to Pokémon White.
* Cobalion: This Steel/Fighting-type legendary is part of the Swords of Justice, found in the sequels Pokémon Black 2 and White 2.
* Terrakion: This Rock/Fighting-type legendary is part of the Swords of Justice, found in the sequels Pokémon Black 2 and White 2.
* Virizion: This Grass/Fighting-type legendary is part of the Swords of Justice, found in the sequels Pokémon Black 2 and White 2.
* Keldeo: This Water/Fighting-type legendary is part of the Swords of Justice, found in the sequels Pokémon Black 2 and White 2.
* Landorus (Therian Forme): This Ground/Flying-type legendary is found in the sequels Pokémon Black 2 and White 2.
* Tornadus (Therian Forme): This Flying type legendary is found in the sequels Pokémon Black 2 and White 2.
* Thundurus (Therian Forme): This Electric/Flying type legendary is found in the sequels Pokémon Black 2 and White 2.
* Genesect: This Bug/Steel-type legendary is found in the sequels Pokémon Black 2 and White 2.
Other "Black" Games:
* Pokémon Black and White 2: You can catch the same legendaries as in Black and White, plus the additional legendaries listed above.
* Pokémon Black 2: You can catch the same legendaries as in Black and White, plus the additional legendaries listed above.
* Pokémon White 2: You can catch the same legendaries as in Black and White, plus the additional legendaries listed above.
Please let me know which "Black" game you're referring to so I can give you a more precise answer!