Secret Key is an item in the “Event items” category (Key Items).
In-game descriptions
| Emerald | The key to the CINNABAR ISLAND GYM’s entrance. |
|---|---|
| FireRed / LeafGreen | The key to CINNABAR ISLAND GYM’s front door. It is colored red and decorated. |
| Platinum · HeartGold / SoulSilver · Black / White · Black 2 / White 2 | A high-tech key that has to be used at a specific location. It emits a special electric signal to open a door. |
| X / Y · Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A high-tech key that has to be used at a specific location. It emits a special electronic signal to open a door. |
Where to find it
| Place | Games | How | Tile |
|---|---|---|---|
| Pokémon Mansion — B1F | FRLG | on the ground | 5, 7 |
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h