They start to talk about it in episode 746. There Ash re meets the Sinnoh region champion and help out a hurt Pokemon (that Team rocket hurt) and help it out. Than they ride a water plane to get to the east part of Unova. There the champion tells Ash someone that he knows is there.
If you want to wait and see DO NOT look below
It's Dawn (the girl Ash traveled with in the Sinnoh region!)
in Pokemon world online what?
lies
I believe Pokemon world online is different from Pokemon crater.
giratina
that's on Pokemon black
in Pokemon world online what?
There are no pokemon in the real world.
Pokemon that there is only one in the world
in real life you can not go in the Pokemon world but you can pretend.:)
you cant get Pokemon in world of warcraft
Pokemon world is a cheap server.
the dream world is where you can get pokemon from different generations.
articuno is not in pokemon world 7.6
Arceus was the Pokemon who created the world and the first Pokemon in it Mew therefore Arceus came first but still leaving Mew the first Pokemon.
lies
it is the alpha Pokemon and it created the world
in pokemon world