PokéBase - Pokémon Q&A
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Or can you? I've heard that it's possible.

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You must win all the stadium cups, and beat the johto and kanto gym leaders + the elite 4. Then you can face him. Then if you beat all the cups/gym leaders again, (much harder this time) you can face the rival again in a rematch. His team in the rematch is ho-oh lugia, and mewtwo.

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Not easy using only rentals...