This is it: the final battle of the Gym Leader Castle. You will go one-on-one against the Rival. His team is entirely dependent on your connected Game Boy game; he will have one of seven different teams. If you have no Game Boy game connected, he will have a team of Pokémon that have no starters or no Eeveelutions. If you have Red or Blue connected, he will have a team that includes the final evolution of the Pokémon that he chose in your game. If you have Yellow connected, he will have the Eeveelution that he has in your game. Onto the battle, it was not a very difficult one, although it was pretty exciting. I used: Starmie (ninjastar), Jolteon (Hazard), and Tauros (Beefy). Rival used: Alakazam, Magneton, and Charizard. Once he is defeated, the Gym Leader Castle is cleared. You will get a reward at the end, and it will be a Pokémon that you can only get one of in the Game Boy games. They are: one of the starters, one of the fossil Pokémon from Mt. Moon (Kabuto/Oma...
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