A: First, you have to complete a majority of the main storyline up to the part to where Maxie Unleashes Groudon, and then the old man should move. He moves so that you can actually access the cave of origin to combat the destructive and enraged forces of Groudon. Groudon is level 45 then, and that's the only time you can see Groudon. So stock up on the supplies that you'll need to catch it if you want to. Plus, it IS where you get the HM07 Waterfall. (im to stupid to tell you how to complete "the main storyline" and i know alot of you have been searching for a while to figure out how to get past the old man and unlock the sootopolis gym, you need to find out where team magma went after mount pyre, and i just don't know, cuz im stupid, so ill give you a bunch a stupid information about this that isn't helpfull, because when i said, "you have to complete a majority of the main storyline up to the part to where Maxi Unleashes Groudon, and then the old man should move"... duhh, rite? you already know that's what you need to do, but I'm going to tell you how to do it because i cant answer your questions and i just feel like typing all this and posting it because it makes me feel special, so you're welcome for all the useless information.)
first find brawly and then heill derectyou to the cave hope this helped cause i been hearing this was right
You need to make a Tokipee eat him.
To get past the man to enter the Cave of Origin you need to reach a certain point in the story. You will not miss the Cave of Origin as the story directly tells you go there once you've reached that point.
After groudon and kyorgre fight you can go inside the cave
The cave is in the back of Sootopolis city but there is a old man blocking the way, and I am having trouble getting the man to move.
Anger the ancient Pokemon and cause craziness to happen to the weather.
beat Clair
you need to do the Pokemon league
Kyogre is found both at the Cave of Origin and at Marine Cave, Groudon is found in Terra Cave both will appear after talking to the man at the weather institute on the top floor.
After you Defeat Team Aqua or Magma g o to stoopopolis and steven and the gym leader there will escort u into the cave (note not go in)
cause they got bord
you have to get the ruby and Sapphire rock
You must have Steven tell him to move.
GET SEATS put in a tv and think what you are using it for