You have to beat the Pokemon League.
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After beating the Pokémon League, your rival will escort you to the Hall of Fame.
you beat the elite four
If you ever played any of the other Pokemon games you'd know the ending is when you defeat the Elite Four, become the Champion and enter the Hall of Fame. Everything after that is basically extra and you can do whatever you want.
025t3rg975690 Type this in gameshark codes to telport their!
sadly, there isn't one. Only in diamond and pearl.