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.
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sadly, there isn't one. Only in diamond and pearl.
there is the place that records your Pokemon for the hall of fame
After beating the Pokémon League, your rival will escort you to the Hall of Fame.
pokecommunity
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beat elite four
You have to enter the Hall of Fame.
Arceus can be encountered in the Hall of Origin in Pokemon Diamond, Pearl, and Platinum. The Hall of Origin is an event-only area that is located above the Spear Pillar. It is accessible only after the player has obtained the Azure Flute and entered the Hall of Fame.
you beat the elite four
Here was my method: Using a Gameboy game register at least three pokemon at level 100, for the other 3 party members select any of the rental pokemon that you need in the hall of fame. Finish the Elite Four as normal and all the pokemon will be registered in the Hall of Fame. Repeat this until you have all the entries.
If I am right, it should be by entering hall of fame
You get a Psyduck that knows Amnesia.
You beat the Champion. Then your name and the pokemon you used will be registered.