Vs. Seeker is an item in the “Gameplay” category (Key Items).
In-game descriptions
| Emerald | A rechargeable unit that flags battle-ready TRAINERS. |
|---|---|
| FireRed / LeafGreen | A device that indicates TRAINERS who want to battle. The battery charges while traveling. |
| Diamond / Pearl · Platinum · HeartGold / SoulSilver · Black / White · Black 2 / White 2 · X / Y · Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A device that indicates Trainers who want to battle. Its battery charges while you walk. |
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