Its friend area is Cryptic Cave and can be brought from the friend area shop
Tyrogue's friend area is mt. Discipline
When rayquaza asks to join the team you automatically unlock its friend area.
It is free when you battle and recruit him.
Stratos lookout
at final island
check gamefaqs.com
You cannot it is only for training to improve your skills and get the type of Pokemon you want on your team if you have the Friend area
Ho-oh.
There's a list of all the Pokemon in that friend area that is found IN GAME when you go to a certain friend area
There are hundreds of Pokemon that you can recruit in Pokemon rescue team. It would take hours to do everything. After you beat the game then you can recruit more Pokemon and buy more friend areas.
Voltorb's Friend Area is "Power Plant" in Pokemon Mystery Dungeon: Blue Rescue Team.
You have to beat the game.