You can only get Shaymin in Pokémon Black and White through a timed limited distribution however you can also transfer one from a previous game such as Pokémon Platinum provided you attended a distribution and received Shaymin during it.
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You cannot catch Shaymin in Pokemon Black or White. You'll need to trade for it from the GTS or transfer it from the Transfer Lab.
You dont. you cant get shaymin in black. you have to transfer it.
Shaymin cannot evolve.
You go to route 224 at the end there will be a white rock and you need the oaks letter in order to get shaymin and a path will open and shaymin will be at the end.Unless you have the walkthrough anything code on AR.
You cannot catch a Shaymin in Pokemon White. However, if you migrate a Shaymin from a Gen IV game, you can get the Gracidea flower to make it sky forme. Go to Lacunosa City (east of Opelucid City after you beat the game) and there will be a girl in the Pokemon center who talks about the Gracidea flower. Talk to her with Shaymin as the first Pokemon in your party and she will give you the Gracidea. (it may not work if you have a hacked, non-event shaymin.