You can trade Darkrai, Shaymin and Manaphy however you can't trade them via the GTS if you got them through store events because they have the Classic Ribbon on them which prevents them from being put onto the GTS however you can still trade them through local wireless trading or even through Wi-Fi trading by exchanging Friend Codes.
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you need a darkrai
No Darkrai cant evolve it is a legendary. The legendarys cant evolve they only shift form! There is a rumor though that drakrai evolves into darkrown. google it and look at it in the game www.pokemonvortex.com.
you cant catch manaphy unless you have Pokemon ranger and do something with that,but you can see it.go to celestic town and read the book on the table in the big house it will show manaphy,like in diamond it shows palkia and in pearl it shows dialga.
The guy that owns the mansion on route 212 has a book with Manaphy's info in it.
You can't. You can only transfer a Manaphy egg from Ranger after completing the Manaphy mission.you cant find it in platinum,but you can either use action replay,go to the Pokemon mansion and look in the book,or if you have a Pokemon ranger game,you can use that.go on Google to know how to do it.