Every generation of Pokemon introduces new Legendaries — some are cover stars, some are event-only Mythicals, and all are among the rarest catches in the game. Here is a compact chronological guide to every Legendary in the series.
Generation 1 — Kanto
Articuno (Ice/Flying), Zapdos (Electric/Flying), Moltres (Fire/Flying) — the Legendary Birds. Plus Mewtwo (Psychic) and the Mythical Mew.
Generation 2 — Johto
Raikou, Entei, Suicune — the Legendary Beasts. Ho-Oh and Lugia as cover stars, and Celebi as the grass Mythical.
Generation 3 — Hoenn
Regirock, Regice, Registeel — the Golems. Latios and Latias — the Eon Duo. Kyogre, Groudon, and Rayquaza — the Weather Trio. Plus Jirachi and Deoxys.
Generation 4 — Sinnoh
Uxie, Mesprit, Azelf — the Lake Trio. Dialga and Palkia — Space/Time duo. Heatran, Regigigas, Cresselia, Giratina, and the mighty Arceus.
Generation 5 — Unova
Cobalion, Terrakion, Virizion — the Swords of Justice. Tornadus, Thundurus, Landorus — Forces of Nature. Reshiram, Zekrom, Kyurem — the Dragon Trio. Plus Victini, Keldeo, Meloetta, and Genesect.
Generation 6 — Kalos
Xerneas, Yveltal, Zygarde. Plus Mythicals Diancie, Hoopa, and Volcanion.
Generation 7 — Alola
Tapu Koko, Tapu Lele, Tapu Bulu, Tapu Fini, Solgaleo, Lunala, Necrozma — plus all the Ultra Beasts (Nihilego, Buzzwole, Pheromosa, etc.).
Generation 8 and 9
Zacian, Zamazenta, Eternatus, Glastrier, Spectrier, Calyrex, Regieleki, Regidrago — and Koraidon/Miraidon from Paldea.