You can't get past him on your own. continue with the game until kyogre and groudon fight in the middle of the lake
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.
nothing
Go to Sootopolis City and talk to the man in the northwestern house.
You actually don't really find Wally, your old pal, in Sootopolis. You either have to try finding him in the west part of Sootopolis, or try resurfacing and surfing more to the west. I dont really know where Wally actually is, but if you find out, contact me at crazykim22@gmail.com.
Find his coffee in the woods beside the Bug Trainer that is slightly annoying.
you've got to find kyogre and groudon, stop team magma and aqua from doing what ever to them then go to the cave that the old man is blocking in sootopolis city and you can go in
Get past all of the other gyms and the old man should move
You have to get the rainbow wing and just a hint you can get the silver wing from the old man in pewter city to get to go to Lugia
mistralton city the house next to the Pokemon center the old man will delete a move and the girl on the left of the old man makes your Pokemon remember a past move.
you need to have the rainbow feather,which you get from the old man on that little cliff in pewter city.
He is in Mistralton City. Go right past the Pokemon center. In the house the old man. Bye.