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I accidentally killed Latios. Can you spawn another Latios/Latias in the Hoenn region?

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Changes from Pokémon Diamond and Pearl
If the player defeats or flees from a stationary Legendary or Mythical 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.

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Emerald is older than DP, so it won't respawn if you saved after defeating Latios. (unless you delete your save)

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GENIUS!