You can use them at azalea town, Johto region. If you go to a house that has a white apricorn outside it, you will find that the man inside can turn your apricorns into different sorts of pokeballs, depending on the colour of the apricorn. If you have any further questions be sure to post a message on my board.
Hope I helped!
They are all over the place, there is some south of ecruteak city, some east of azalea town. I don't think anyone could be bothered going and finding all of them. Hope I helped!
no, but use can use poketransfer from heartgold to white
No.
You use it
It is really easy. Give Kurt the right Apricons that make a friend ball and you have a few friend balls.
AR is used the same on Heartgold as it is with any other game, you put AR in, then it will ask you to put in Heartgold. Follow Instructions xD.
Staryu.
use a moon stone
ho oh
use the water stone
To get hippopotas in heartgold and soulsilver you need to go to safari zone and use special items.
you use waterfall at the Pokemon waterfall or the battlefield.