It is free when you battle and recruit him.
It makes Pokemon join you more frequently.
Ancient Relic.
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.
When rayquaza asks to join the team you automatically unlock its friend area.
Tyrogue's friend area is mt. Discipline
have a high level Pokemon with a friend bow
go to western cave and bring a friend bow
You keep fighting them holding the friend bow
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
buy friend areas if ur lucky when u defeat a pokemon it MIGHT ask 2 join ur team
check gamefaqs.com
With level 100, IQ MAX, Small pokemon size, Friend bow and only one pokemon in the team.