Gym Leader Castle: The Elite Four 四天王 R-2 | Pokémon Stadium 2 

The Elite Four (Japanese: 四天王 The Big Four) are four Pokémon Trainers who are regarded as the toughest in their regional Pokémon League, just short of the Pokémon League Champion. Those who challenge the Elite Four must have won all eight Badges from that region (or, for Trainers in Alola, must have completed all of their island challenge trials). To become Champion, Trainers must face all four and the current Champion consecutively without losing to any of them. Challengers who lose at any time must start their challenge from the beginning. In Paldea, the challenge is named the Elite Test, and is part of the greater Champion Assessment.
One group resides at the Indigo Plateau in Kanto and are considered the best Trainers in both Kanto and Johto. Another group is located in Ever Grande City in Hoenn, while another is located on Mount Lanakila in Alola. Four more groups reside at the Pokémon Leagues in Sinnoh, Unova, Kalos, and Paldea.
In the games, they use strong medicine items in battles. In Generation II, they use Max Potions, and from Generation III onwards, they use Full Restores. Like Gym Leaders, they typically specialize in Pokémon of a particular type. Prior to Generation V and in Paldea, the Elite Four typically progresses in level with their Pokémon in the games and must be challenged in a set order. From Generation V to Generation VII, all members of the Elite Four (except in remakes) use Pokémon of the same levels, as they can be challenged in any order. At Blueberry Academy, Crispin's Pokémon are one level lower than the others, but the Elite Four can be battled in any order.
In Generation VIII, the Pokémon League in the Galar region uses the Champion Cup tournament instead of an Elite Four.
A Gym Leader Castle (Japanese: ジムリーダーのしろ Gym Leader Castle) is a location in the Pokémon Stadium series where players may battle the Gym Leaders (and their disciples) and the Elite Four of the Pokémon games of that generation.
The Gym Leader Castle in Pokémon Stadium 2 features differently-designed rooms for each of Johto's Gym Leaders, each one representing the Leader's type in its design. Like in its predecessor, the player needs to defeat each of Johto's Gym Leaders in turn, now including an intervention by Team Rocket between the Olivine and Mahogany Gyms, and eventually making their way to the Elite Four and its Champion, Lance. Upon his defeat, if all Pokémon on the player's team came from a Game Boy cartridge, one of them can relearn a move that was available for it on an earlier level.
After the defeat of Lance, mirroring the story progression in Gold, Silver, and Crystal, the player can challenge a revamped version of the Kanto Gym Leader Castle. Though it has the same battle arenas as the first game, the castle itself is notably different: the eight Badges of Kanto are on the sides of the castle's towers, which are arranged closely together. No Gym Trainers are featured, and the Gym Leaders can be faced in any order. After all eight of them have been defeated, the player can challenge Red in a cave separate from the castle itself. Defeating him finishes the Kanto Gym Leader Castle.
For beating the Gym Leader Castle in Round 1, the player will receive the Doduo Sticker mode (if not all Stadium Cups have been beaten in Round 1) or the Dodrio Sticker mode (if all Stadium Cups have been beaten in Round 1) for the Game Boy Tower for Generation I games.
For beating the Gym Leader Castle in Round 2, the player will receive the Doduo Sticker mode (if not all Stadium Cups have been beaten in Round 2) or the Dodrio Sticker mode (if all Stadium Cups have been beaten in Round 2) for the Game Boy Tower for Generation II games.
Additionally, the player can use the Move Reminder option each time that he beats the Elite Four and the Champion in the Round 1 or the Round 2 as long as they meet the following requirements: their six Pokémon come from a Generation I or Generation II core series game, they can't be registered, and the player has to beat the Elite Four and the Champion in a single sitting (they can't use the Suspend option).
Completing Pokémon Stadium 2
/ @akatoy1991