i think it is in sandgem town but not sure.you also might find iit in eterna but still not sure. but if not check the others and look for an old man with a grey beard. talk to him and he will answer "have ye heard of shaymin" or something like that. but if he does, answer no and he will give you a poke phone. he will also give you professer Oak's number. then you call him i think.i think he calls you back and says your mom( only in the game ) found something in her tree and to come to get it .go to his house in eterna ( that's how i got the idea of it being in eterna) and he gives you like the Oak's letter or something then he goes to the side route in victory road.( its the place where you help marlie through and at the exit she said she came to find the Pokemon that visits that big flat rock. if you go there (after getting oak's letter )oak will be standing by the rock. then he will tell you stuff and ask you what you give thanks for. say Pokemon. then he will say "is that what your thankful for positivley sure" say yes and there will be flashes and then you will be in flowers. then a little bettle looking Pokemon comes. that is shaymin.but it runs off follow it and then catch it. there is a myth that arces lives there too but i don't know where.WARNING: PAY CLOSE ATTENTION. IF YOU SAY YES WHEN THE GUY ASKS ABOUT SHAMIN HE WILL FLY AWAY AND NEVER COME BACK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! there is also a myth that the poke phone never existed. i don't believe it though. this tip is only for diamond and pearl not for gameboy games.
I don't know who said this or where the crap they got it from, but this is NOT true. There is no pokephone. You cannot get it normally, or by use of cheat. IT DOESN'T EXIST. If you doubt me, ask Nintendo. I did, and they told me it is nonexistent. If you do, and they tell you otherwise, then I stand corrected. But you wouldn't call Nintendo a bunch of liars, now would you?
talk to a girl in the eterna city Pokemon center on 1F
There is a Poke Center in each town. They are the houses with the orangey-red roof and a picture of a white poke ball in the middle. They have a big glass door thing as well. Talk to the lady behind the desk and she will heal your pokemon.
in brycen's town in the poke-center
Go to poke center and open the computer and write 4212
he is trying to get to nimbasa city and steal the poke balls at the pokemon center, also he is just pretending to be there friend
the trade center is up stairs in the poke center
In every town there is a Pokemon centre.
connect to gameboys and trade at a poke center...
you head up to the route past the poke center and then that one girl will teach you how to catch a poke
talk to a girl in the eterna city Pokemon center on 1F
In Solaceon Town, right next to the poke center
The poke mart is inside the poke center now. Right when you walk in.
There is a Poke Center in each town. They are the houses with the orangey-red roof and a picture of a white poke ball in the middle. They have a big glass door thing as well. Talk to the lady behind the desk and she will heal your pokemon.
it will be unlocked by paying a dude in some poke center 22222 poke dollars
a chef or a poke mart. the pokemart located in the pokemon center
it is 3 houses left of poke center
It is in celstic town behind the poke center.