Enigma Stone is an item in the “Event items” category (Key Items).
In-game descriptions
| HeartGold / SoulSilver · Black / White · Black 2 / White 2 | A crystal ball that was excavated from the ground. A very beautiful stone that is covered with bits of rock and earth. |
|---|---|
| X / Y · Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A crystal ball that was excavated from the ground. It’s a very beautiful stone that is covered with bits of rock and earth. |
Where to find it
Not placed on the atlas maps (so far: Red/Blue and Generation 3).
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h