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A Formidable Rival! (Japanese: 油断大敵！？強力ライバル登場 Unpreparedness is the Greatest Enemy!? A Formidable Rival Appears) is the twenty-third chapter of the Pokémon Ruby-Sapphire manga.

Humans

 * Red (Ruby-Sapphire)

Humans

 * Red (Pocket Monsters)
 * Red (Ruby-Sapphire)

Pokémon

 * (both of them)
 * (Red's)

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