This is the list of Pokémon that the twins have caught throughout the Kanto Saga. The Pokémon that are on hand are the ones they're bringing along to the next region.

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Ashley Josephine Ketchum

On hand:

Firered the Charizard (male)

Cedric the Larvitar (male)

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With Professor Oak:

Luna the Clefairy (female)

Kobra the Arbok (male)

Wanda the Gyarados (female)

Oliver the Vileplume (male)

Volt the Jolteon (male)

Rina the Nidoqueen (female)

Chanchan the Hitmonchan (male)

Kabo the Kabutops (male)

Hunter the Aerodactyl (male)

Queendra the Seadra (female)

Aria the Lapras (female)

Sunny the Rapidash (female)

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In training:

Bruce the Primeape (male)

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Released:

Honey the Butterfree (female)

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Ashton Joseph Ketchum

On hand:

Ivysaur (male)

Pikachu (male)

Charizard (male)

Wartortle (male)

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With Professor Oak:

Beedrill (male)

Squirtle x4 (males)

Kingler (male)

Gengar (male)

Muk (male)

Tauros (male)

Rhydon (male)

Exeggutor (male)

Nidoking (male)

Poliwrath (male)

Dragonair (female)

Hitmonlee (male)

Omastar (male)

Mimey the Mr. Mime (male)

Snorlax (male)

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In training:

Primeape (male)

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Released:

Pidgeot (male)