From Bulbapedia, the community-driven Pokémon encyclopedia.
A Game Boy Tower (Japanese: GBビル GB building) is a location in the Pokémon Stadium series where players may play Game Boy Pokémon games using the Transfer Pak. The Tower places a border around the game screen, using the same borders as the Super Game Boy accessory.
The player can unlock upgrades for the Game Boy Tower by completing various cups. The Doduo Game Boy Tower allows games to be played at twice the speed, while the Dodrio Game Boy Tower allows games to be played at three times the speed (four times the speed for Generation I games in Pokémon Stadium 2).
The Doduo Game Boy Tower is unlocked in the original Stadium by completing the Poké Cup or the Prime Cup, while the Dodrio Game Boy Tower is unlocked by completing both cups. In Stadium 2, the Doduo Game Boy Tower is unlocked for Generation I games by completing the Gym Leader Castle or clearing all of the Stadium Cups in Round 1, and the Dodrio Game Boy Tower is unlocked by completing both. To unlock the modes for the Generation II games, the same requirements must be met in Round 2.
Stadium 2's Doduo mode when used with a Generation II game changes the border to black and applies a sepia-tone effect to the game display. Stadium 2's Dodrio mode when used with a Generation II game changes the game display's tone to black-and-white. Additionally, these modes can't be used with a Generation II game until the Generation II game clears the Elite Four for the first time.
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