DESC
| - Ability: Keen Eye.
- Leaf brought out her Nidorino to battle Mewtwo at the Viridian City Gym, but he was no match. Nidorino later helped against a flock of Spearow and Fearow.
- Leaf brought out her Venomoth to battle Mewtwo at the Viridian City Gym, but it was no match.
- Rapidash was among the Pokémon Leaf brought with her to New Island, where it was cloned by Mewtwo. Rapidash later helped against a flock of Spearow and Fearow.
- Leaf brought out her Raticate to battle Mewtwo at the Viridian City Gym, but it was no match. Raticate later helped against a flock of Spearow and Fearow.
- Tentacruel was among the Pokémon Leaf brought with her to New Island, where it was cloned by Mewtwo. Later, it was seen spending time on the beach on Tangelo Island.
- Ninetales was among the Pokémon Leaf brought with her to New Island, where it was cloned by Mewtwo. Ability: Flash Fire.
- Leaf brought out her Parasect to battle Mewtwo at the Viridian City Gym, but it was no match. Later, Parasect spent some time on the beach on Tangelo Island.
- Leaf brought out her Beedrill to battle Mewtwo at the Viridian City Gym, but it was no match.
Ability: Swarm.
- Leaf's starter Pokémon. Bulbasaur later evolved into Ivysaur and she used Ivysaur in the final round in the Cerulean City Battle Chateau against Serena's Charmander, Charla.
Ivysaur later evolved into Venusaur when Leaf brought it out to battle Mewtwo at the Viridian City Gym, but it was no match. Venusaur was also used to battle Venusaurtwo, but it lost.
Venusaur later helped against a flock of Spearow and Fearow. Later, Venusaur spent some time on the beach on Tangelo Island.
Ability: Overgrow. Known moves: Vine Whip, Sweet Scent, Leech Seed, Take Down, Razor Leaf, Toxic.
- Dewgong was used to help transport Leaf and her friends to New Island, and would later be captured by Mewtwo to make clones for himself.
Dewgong later helped against a flock of Spearow and Fearow. Later, Dewgong spent some time on the beach on Tangelo Island. Dewgong would see action during the Water Pokémon Tournament. Later, Dewgong was Ash's Larpas' training partner for Ash's battle against Drake on Pummelo Island.
Known moves: Aqua Ring, Aurora Beam, Ice Beam, Horn Attack.
- Sandshrew was first seen at the Cerulean City Battle Chateau.
It was later revealed to have evolved into Sandslash when Leaf brought it out to battle Mewtwo at the Viridian City Gym, but it was no match. Sandslash was later captured by Mewtwo to make clones for himself.
Sandslash later helped against a flock of Spearow and Fearow. Later, Sandslash spent some time on the beach on Tangelo Island.
Ability: Sand Veil. Known moves: Magnitude, Poison Sting, Defense Curl, Rollout.
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