it already did i think
There are a lot of events on Pokemon Platinum.
nothing
You can't "find" him. You have to trade the egg from Pokemon ranger over to platinum, where you can hatch it.
To finish the sinnoh dex (Pokemon platinum's,diamond, and pearl dex) you just need to see every Pokemon not catch every Pokemon.
Yes you can
Yes, you can. All you have to do is finish the game and then you are able to trade any Pokemon. like diamond, pearl, platinum, heartgold, and soulsliver.
check serebii.net for info on upcoming events for Pokemon Diamond,Pearl,Platinum.
You can't, Celebi is obtainable by events. The only way you can find a Celebi in Pokemon Platinum is by cheating.
You can get Pokemon from the older versions on Pokemon Platinum, but I'm not sure if it includes every Pokemon from every game. You'll need to finish your Pokedex, then get the National Dex.
Nintendo events!!! google it
you have to download them at a Nintendo event
ar codes or Nintendo events