Hi i have pokemon black and would like a fateful encounter shaymin, to get a sky shaymin.

I have
Darkrai
Regirock
Rigisteel
Regice
Regigigas
Lugia
moltres
zapdos
articuno
and Mew.

i would really appreciate a real fateful encounter shaymin.
i also have many morepokemon if your interested :).