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Legally: You need to dump your own cartridge of the Spanish version of Inazuma Eleven 3: Rayo Celeste using a 3DS with custom firmware (GodMode9). Inazuma Eleven 3 Rayo Celeste 3ds Rom Espanol
Si encuentras una página que dice "Parche al español v3.0 by IEH", verifícala en foros como o GBAtemp antes de descargar. Do you need a guide on for smooth performance