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you need action replay in your ds
You can trade, use the action replay for Pokemon Platinum, or actually catch it without the action replay. If you have completed the Sinnoh Pokedex, go and see Professor Rowan, and he will give you the National Pokedex, then you catch all the Pokemon throughout the land of Sinnoh from all the other regions due to an "outbreak". But, where to catch caterpie specifically, you need to go to Eterna Forest, west of Eterna City.
Previous answer: You can't unless you use action replay, hack, or trade.if you do action replay you people who use it are a freak and a cheat so shut your gob and stop using action replay ars holes My answer: Most of the National Pokedex Pokemon can be found on the island with the battle frontier. The rest you have to either trade in from another game, or do a Wi-Fi event to get the other legendarys like Darkrai. I don't know if the Wi-Fi event Pokemon count in the NAtional dex.
you cannot get manaphy without action replay if you go to the Pokemon mansion with the garden theres a book you can read that will add it to your pokedex
NO, that is impossible. You need to trade and migrate Pokemon to complete the national dex.