The post-game feature in Pokmon SoulSilver allows players to transfer Pokmon from their Game Boy Advance era games, such as Ruby, Sapphire, Emerald, FireRed, and LeafGreen. This migration process takes place within a designated area, enabling the relocation of Pokmon caught or raised in the older titles to the Nintendo DS version.
This mechanism served as a bridge between different generations of Pokmon games, allowing players to maintain their collections and continue using their favorite Pokmon in the newer installment. Its introduction addressed concerns about Pokmon becoming obsolete with each new generation and provided a valuable incentive for players to revisit and engage with their older games. The process offered a one-way transfer, meaning Pokmon moved to SoulSilver could not be sent back to the original GBA games.