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When Ash goes from one region to the next, he always take along Pikachu, due to Pikachu being his partner. The rest of his Pokémon he sends to Professor Oak, as such he can be sent Charizard or any other Pokémon if it's necessary in battle.

In addition, when Ash goes to a new region his badge level is none. This makes him a newbie, so it wouldn't be right to have a newbie with super strong Pokémon. Pikachu's level is reset as well to make this completely fair.

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11y ago

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