Yes you do. When I tried to catch darkrai with my member's card from the mystery gift before i got my national pokedex, the kid in the house in front of the sailor ships was supposed to be asleep, but he was awake and out of bed, but after I discovered every sinnoh region Pokemon and talked to professor rowan (professor oak came in and gave me the national pokedex), he was asleep in bed saying,"Darkai is watching me.", I knew i could catch him now. So that's the answer, you need one. (The same with Shaymin.)
No
You need to get the national pokedex to get national pokedex you need to get all the Pokemon and you need to talk to daun's sister
no
In Pokemon Diamond and Pearl you need the National Pokedex to get Magnemite. In Pokemon Platinum you don't need the National Pokedex to get Magnemite.
No because it is a sinnoh Pokemon not a kanto, johto, or hoenn
no
you need an event item to get in. to get the item you need the mystery gift. if you do in, you get to catch a darkrai.
You can catch Darkrai after you battled the league and won since you need a national pokedex. To actually catch Darkrai, go to the island( new moon) wich is beside full moon island
Obviously you need it to complete the national, otherwise darkrai will be missing:) not needed for regional though.
No
No you do not... i didnt
You need to get the national pokedex to get national pokedex you need to get all the Pokemon and you need to talk to daun's sister
you need to have the national pokedex
No!,you just need to see them
no
you have to complete the national pokedex then sailor eldrich will take you to the other side of full moon island and that is where darkrai is on platinum.
at mt coronet and you need a superrod,national pokedex