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Legendaries spawn in the wild like anything else, just rarely. Only one can be out in a server at a time, and if it gets away it comes back to that server until somebody catches it.

Legendaries in the wild
- They spawn like any other Pokémon, then stay longer.
- You can’t run from a legendary battle.
- If you lose to one, someone else can still try.
- If it gets away, it comes back to the same server until it’s caught.
- Every legendary you catch has at least 3 perfect IVs.
The roamers
Seven legendaries roam: Raikou, Entei, Suicune, Latias, Latios, Mesprit, Cresselia. They bolt after a single missed ball, but they keep any damage you did, so every attempt wears them down. Trapping moves and abilities keep them from running.
Regigigas
Own Regirock, Regice, Registeel and Regigigas gets easier to catch.
Giratina
Giratina never spawns normally. It only comes through a tear from the Distortion World, a rare event that can open in a server.
Mythical Pokémon
Mythicals never spawn wild. Each one has a Special Research story in /specialresearch, and finishing it brings you face to face with the mythical in a private encounter. Mythicals you meet this way can’t be traded or sold. More on Research.
Keep a look out. The next one could be in your server.