You have to beat all the gym leaders from sinnoh and so and also the elite four, so you can catch them. First of all It will be hard to find them, so have a keen eye. Remember to stock up on master balls if you want to catch them. Rare Pokemon like Dialga or Manaphy or Arceus and so on.
also what is Pokemon vortex
You cannot get rare candy that way.
just battle with a Pokemon
you will find beldum in the cave
In the grass area
none
Umar yes it is legendary, But it is very rare to find
Pokemon that there is only one in the world
you will find feebas in the water of grass maps in pokemon vortex
You cannot get rare candy that way.
Acshoin replay
just battle with a Pokemon
You find him in map 18.
you will find beldum in the cave
In the grass area
none
Well i've never played pokemon vortex but i'm pretty sure it's the same as any online pokemon rpg game so just get a bunch of rare candies once your pokemon reaches lv100 use the rare candies on them to level them up some more.
You'll find it in the electric maps