Isis was a worker who participated in the construction of a bridge. She appears with a Bibarel who carves the stone for the bridge. However, she was in trouble, as Bibarel wouldn't listen to her.
Bibarel is a Pokémon the Expert Stonecutter left for her to take care of. When the master stone cutter left them to do work, Bibarel became lazy, but this was to prevent the bridge to be constructed, as it would collapse.