In Pokémon Ultra Sun and Pokémon Ultra Moon, four Generation 1 legendary Pokémon can be caught through the Ultra Wormhole.
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How to find the Generation 1 legendary Pokémon
Most legendary Pokémon from before Generation VII have been moved to Ultra Worlds called “Ultra Space Wilds”. To get there, enter the Ultra Wormhole at the Altar of the Sunne/Moone and go through a portal that isn’t white. As with other Pokémon, you then just need to go to the end of the area to trigger the encounter and try to catch it. So bring a good stock of Poké Balls before you go!
The presence of the Generation 1 legendary Pokémon, which occurs randomly on each trip, is reported as a “strong presence” when you land in their area. Each one is available as a single specimen. When all the Pokémon in a setting have been caught, the presence is reported as lost.
There are four of them: Articuno, Moltres, Zapdos, and Mewtwo. You can even see Mewtwo’s shadow on the rock when it is present. You can soft-reset to make them appear in their shiny form, as you would normally do once you’re about to encounter the Pokémon in question.
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Articuno, Moltres and Zapdos
To encounter these three Pokémon, you need to go through a red portal to reach the cliff setting of the Ultra Space Wilds.
| Artikodin | |||
| © Pression | |||
| Level 60 | |||
| GlaceVol | |||
| No item | |||
| Roche | Ancient Power | Glace | Freeze-Dry |
| Psy | Protect | Glace | Hail |
| Electhor | |||
| © Pression | |||
| Level 60 | |||
| ÉlectrikVol | |||
| No item | |||
| Roche | Ancient Power | Électrik | Discharge |
| Vol | Pluck | Eau | Rain Dance |
| Sulfura | |||
| © Pression | |||
| Level 60 | |||
| FeuVol | |||
| No item | |||
| Roche | Ancient Power | Feu | Flamethrower |
| Vol | Air Slash | Feu | Sunny Day |
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Mewtwo
Mewtwo, for its part, is found deep in the cave setting of the Ultra Space Wilds, via a green portal.
| Mewtwo | |||
| © Pression | |||
| Level 60 | |||
| Psy | |||
| No item | |||
| Psy | Psychic | Normal | Recover |
| Normal | Swift | Psy | Psycho Cut |
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