Rematch/Types/Legendary and special encounter Pokémon

In all games, being defeated by a Legendary Pokémon does not cause it to disappear. In all games in which roaming Pokémon exist, fleeing from them does not cause them to permanently disappear; the game simply behaves the same as if they were the ones to flee.

Prior to Pokémon FireRed and LeafGreen, fleeing from stationary Legendary Pokémon causes the Pokémon to permanently disappear.

In Pokémon FireRed, LeafGreen, and Emerald, if the player flees from a stationary Legendary Pokémon, it will reappear upon leaving and re-entering the room. The game informs the player that "The flew away!"

In Pokémon Platinum, if the player defeats or flees from a stationary Legendary Pokémon, it reappears after the player next enters the Hall of Fame. If the player defeats a roaming Pokémon, it will reappear only after the player has re-triggered the event which caused it to start roaming; for example, the player must talk to Professor Oak to cause a Legendary bird to resume roaming. If the player flees from or defeats Origin Forme in the Distortion World, it will reappear in Turnback Cave in its Altered Forme, where it behaves in the same way as all other stationary Legendary Pokémon.

This was extended to all stationary Pokémon (red Gyarados,, and ) in HeartGold and SoulSilver. If is defeated or fled from, Eusine will comment on this fact, and it will instead reappear at the Burned Tower, where it behaves in the same way as all other stationary Legendary Pokémon. If or  is defeated or fled from during the storyline, the Kimono Girls will comment on this fact before leaving; however, the Pokémon still behave like any other stationary Pokémon.

In Pokémon Black and White, or  must be caught; defeating, fleeing from or losing to the Pokémon does not cause it to disappear, the battle yields no experience, and the story cannot be progressed until it is caught. However, if the player has a full party and PC, it is possible to progress without catching it, in which case it instead appears at Dragonspiral Tower after defeating Ghetsis, where it behaves in the same way as all other stationary Legendary Pokémon, except that it will still not give any experience points.

In Pokémon X and Y, or  must be caught; defeating, fleeing from or losing to it does not cause it to disappear, the battle yields no experience, and the story cannot be progressed until it is caught. The 31st box in the Pokémon Storage System does not become available until after the player catches it, so it is not possible to avoid the capture even if the player's party and PC are both full.

In Pokémon Omega Ruby and Alpha Sapphire, if the player defeats or  instead of catching them in the main story, they will reappear in the Cave of Origin after entering the Hall of Fame. During the Delta Episode, must be caught; defeating, fleeing from or losing to it does not cause it to disappear, the battle yields no experience, and the story cannot be progressed until it is caught. The 31st box in the Pokémon Storage System does not become available until after the player catches Rayquaza, so it is not possible to avoid the capture even if the player's party and PC are both full. If the player flees from or defeats in during the Delta Episode, it will reappear at the Dragonhark altar atop the Sky Pillar after entering the Hall of Fame again, where it behaves in the same way as all other stationary Legendary Pokémon.

In Pokémon Sun and Moon, or  must be caught; defeating, fleeing from or losing to it does not cause it to disappear, the battle yields no experience, and the story cannot be progressed until it is caught. The 31st box in the Pokémon Storage System does not become available until after the player catches the Legendary Pokémon. If the player defeats, flees from, or loses to instead of catching it during the post-credits event, Lillie will comment on this fact, and Tapu Koko will immediately be available to battle again at the Ruins of Conflict. If the player defeats, flees from or loses to a roaming Ultra Beast or, it will continue to reappear in the area until it is caught (the game reassures the player that it is still in the area).

In Pokémon Ultra Sun and Ultra Moon, or  must be caught for it to disappear; defeating, fleeing from or losing to it does not cause it to disappear and the battle yields no experience. The 31st box in the Pokémon Storage System does not become available until after the player catches the Legendary Pokémon.