Generation II
In the Generation II games, the player may only battle once per day. As a regular Trainer battle, if the opponent has a Pokémon that the player has not seen before, they are registered as "Seen" in their Pokédex.
The Trainer in the basement will be the last person who the player used Mystery Gift with, with their team being whatever Pokémon were in the other person's party at the time. Only the Pokémon's species, levels, and moves are transferred—the Pokémon do not retain their nicknames, held items, stats (including IVs), gender, Shiny coloration, or form (in the case of Unown).
Performing Mystery Gift with Pokémon Pikachu 2 GS does not affect the Trainer House, leaving the current Trainer unchanged. If the player most recently performed Mystery Gift with Pokémon Stadium 2, Carrie appears in the Trainer House, using one of three possible parties (determined at the time Mystery Gift is performed). If the player has never used Mystery Gift before (except possibly with Pokémon Pikachu 2 GS), the Trainer will be Cal, using the following team:
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Reward: $5000
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Several glitches can affect the Trainer that appears in the Trainer House.
Generation IV
In Pokémon HeartGold and SoulSilver, the player will initially find only Ace Trainer Cal in the basement of the Trainer House. When the player connects their Pokéwalker with another person's and then resyncs it back to their game, the other Trainer and their Pokémon will appear in the basement of the Trainer House. A maximum of ten additional Trainers besides Cal may be gathered in this way.
Other Trainers' teams will consist of whatever Pokémon (including held items) were in their party when they sent their Pokémon to the Pokéwalker, with the level of Pokémon capped at level 50. After a battle, all Pokémon will be restored to full health and held items restored. Players will earn no experience or money, but they will receive 1 Battle Point for winning. If an opponent has a Pokémon that the player has not seen before, the Pokémon will not be added to the Pokédex.
Through the use of two Pokéwalkers, connected to the player's game and a friend's, the player can battle themself by connecting the Pokéwalkers and receiving a gift from the friend's Pokéwalker.
Below is Cal's team in these games.
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Reward: 1BP
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