I defeated Will, Koga, Bruno, Karen, and Lance in R1 of Pokémon Stadium 2 with Lance's R1 team with the exact same movesets, held items, and stats. After that, I defeated Will, Koga, Bruno, Karen, and Lance in R2 with Lance's R2 team with the exact same movesets, held items, and stats.
Note that I did make a mistake by applying PP Ups to all of my Pokémon when neither of Lance's two Pokémon Stadium 2 teams have PP Up applied, but this didn't actually affect any of my battles.