That's it. If i'm correct, you need rocksmash to break a wall in order to get it.
As for Noel, i've been stuck at him twice, so i know your feel bro... Try some Steel types. Fighting types would be obvious but i'm pretty sure he has two flying types so... Try some resistance instead of attackers, i'd say. My magnezone and Vileplume were kinda useful if i remember correctly. Physycal sweepers of all sorts should fit too.