you can't
When rayquaza asks to join the team you automatically unlock its friend area.
the friend area of groudon is not really important. you dont need the friend area to recruit it. it joins you and the friend area comes with it.
Rainbow Peak
Sky Blue Plains is a Friend Area in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team that is rewarded to the player after a random rescue mission. After clearing Pitfall Valley, and unlocking this Friend Area, Celebi's Domain is unlocked. After getting this Friend Area, players also receive a mission that unlocks Howling Forest and the end of the mission gives players a level 5 Smeargle. It is in the Plains area, and has the capacity of thirteen Pokémon, all of them of the Normal- and Psychic-types.
luck a friend bow sometimes a secomd battle and a friend area
You can get the Blue Sky Meadow friend area by completing the Rescue Jumpluff mission in Pokémon Mystery Dungeon: Red Rescue Team or Blue Rescue Team. After completing the mission, Jumpluff will reward you with the Blue Sky Meadow friend area.
GET THE FRIEND AREA"SKY BLUE PLAINS"FROM RESCUE MISSION.
check gamefaqs.com
at final island
P.S the friend area you want comes with it
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