There isn't much grass here...But there does seem to be plenty of pokemon trainers waiting to challenge you!
While you attempt to find pokemon, and/or make your way through the mass of trainers, you may be lucky enough to find something on the ground. With all these people lurking around corners, it's a large chance!
Don't jump over to many ledges though...You may have to start all over. And those trainers you beat before? They might be ready for a rematch.