lol. i had the same problem. once you have beaten all 20 chapters and you do the thing with manaphy,after a couple days you can go to the guild and talk to team charm
some time after you beat the game go to the second floor of the guild (where the swap shop is) the other guild members will be talking to team charm and team charm will let the guild members go to...
After you have completed Aegis Cave,you will unlock Concealed Ruins.Warning!It has 30 floors,so be very cautious and concentrated.Once you get to the top,you will battle Raikou.You cannot recruit...
After you beat Primal Dialga, you have to graduate from the Guild. After that, you have to rescue Scisor, (hope I spelled it right) the explorer from many years ago. Soon, you will find a Manaphy...