Items, Event items, #470
Enigma Stone appears in 8 version groups since Generation IV, an Event items item in the Key Items pocket
PokéAPI item 470 of 2,223, Event items category, Key Items pocket
Effect, in PokéAPI's words
Enigma Stone: “S: Summons Latias H: Summons Latios.”
When taken to the Pewter City museum, causes Latias or Latios to attack the trainer. The Pokémon to appear will be whicher can’t be encountered roaming in the wild.
Games
Enigma Stone is listed in the text of 8 version groups, first in Generation IV
Game index by generation
IIIIIIIVVVIVIIVIIIIX
Named in
HeartGold and SoulSilverBlack and WhiteBlack 2 and White 2X and YSun and MoonUltra Sun and Ultra MoonLet's Go Pikachu and Let's Go EeveeSword and Shield