How....could you have not tried that in an hour of wondering around that route?
I honestly have no clue. It never once crossed my mind that those were an option.
So what, then? you just thought they were apart of the scenery? Or that you needed a TM to traverse them? I know you could see that item, so you just never even tried to get it? It's not even like the path is hidden, there are TWO different paths you could have taken.