It should be noted that of all the compatible games, only two of them will give benefits to the Game Boy or Game Boy Color game, but rather just the Nintendo 64 game. For example, while you can transfer your characters from the GBC version of Mario Tennis over to the Nintendo 64 version, you can't transfer the N64 version's characters over to the GBC version. The exception are Pokémon Stadium and Pokémon Stadium 2 which allow for the modification of the player's team. Pokémon Stadium also unlocked a minigame in Pokémon Yellow.