From Bulbapedia, the community-driven Pokémon encyclopedia.
The Vs Seeker is a key item that appears in Pokémon FireRed and LeafGreen and Generation IV used to re-battle Trainers that the player has battled previously.
Locations and uses of the Vs Seeker
When used, the Vs Seeker sends out a signal that allows Pokémon Trainers to find other Trainers who want a rematch. This signal affects all Trainers that are within the player's view. Once used, the device cannot be used again until it is charged. The player does this by walking a total of 100 steps. The effect on the Trainers wears off either when they have been battled, when the player leaves the route, or when the player walks 100 steps within the route. If the player attempts to use the Vs Seeker when it is not fully charged, the player will be told how many steps remain for it to function. It is interesting to note that after using a Vs Seeker, some trainers may have higher leveled Pokémon than the last battle.
The Vs Seeker can be obtained from a girl in Vermilion City Pokémon Center, claiming that she is giving them out to everyone for free. The indication of a rematch is initially a speech bubble above the Trainers' heads with a black double exclamation mark (!!). After that, the Trainers jump up and down to remind the player post-battle of who wanted a re-match. Trainers that have not been battled previously by the player display a single red exclamation mark (!), and do not jump up and down. Trainers that do not wish to battle display a blue speech bubble containing a white X.
The Vs Seeker is received from Dawn/Lucas on Route 207 after the first trip down Cycling Road in Diamond and Pearl. In Platinum, instead he/she meets the player at the entrance to Mt. Coronet. The indication of a rematch in Generation IV is similar to that of Generation III. The initial reaction is a speech bubble containing a double red exclamation mark (!!), and the Trainers rotate in place afterwards. If a Trainer does not want to battle, they will do nothing.
In the Manga
According to the Pokémon Special manga, the Vs Seeker was designed by Bill and works by sensing the fighting spirit of willing Trainers.
In the TCG
The VS Seeker has appeared as a card in the Pokémon Trading Card Game.
- Red and Leaf, in their Generation III designs, wear them on their backpack straps.
- The Pokénav and the Vs Seeker share a resemblance to each other in both looks and functions.
- The character Pokémon Trainer in Super Smash Bros. Brawl has a Vs Seeker.