you cant but you can if you go to hearthrome city and go to the park at the very top of the city
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Your Pokemon cannot follow you around in Pokemon Platinum. It is only available in Pokemon HeartGold and SoulSilver.
Pokemon diamond
you cant be a Pokemon in Pokemon diamond
You have to walk around with it. It will hatch faster if you have a Pokemon with the ability Flame Body.
You need to complete Pokemon Sapphire and Diamond and in Diamond you will need the National Dex. Go to the title screen of Diamond and press Start, then choose "Migrate from Sapphire" and follow the instructions. Choose the 6 Pokemon you want to migrate to Diamond, then confirm your choice. The 6 migrated Pokemon will be in the Pal Park and can be caught with 100% catch rate.