after you complete the national dex, go to eterna city. Talk to proffessor oak. He's in a house near the gym. He'll tell you that you have completed the national dex. Go to route 224. Keep going up and up the mountain area until you find a silver tablet. You will find oak waiting for you. Talk to him, and a shaymin will appear. It will run away as soon as it see's you. There will be a very, and I mean vey long flower path. Use a bike to ride across it. After you get to the end, you will see shaymin. It will be level thirty. I suggest using moves like hypnosis or falswipe. If you have a Roselia or Roserade, use a grasswhistle.
no that's what happens when you get oaks letter from the mystery gift
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Oak just shows up out of nowhere that's it.
NO, that is impossible. You need to trade and migrate Pokemon to complete the national dex.
where to catch lotad in Pokemon platinum i really need one to complete the national dex
In Pokemon Platinum to get the National Dex you will need to have seen all 210 Pokemon in the Sinnoh Dex then talk to Professor Rowan and then after a while Professor Oak will give you the National Dex!
In Platinum dex' its Dusknoir in National dex' its Sunkern.