Audinite

==Information==
Location: Azurine Lake
Available: After Badge 13
==Guide==
Go to Apophyll Academy. Then go left and go all the way up.
When you reach the cave, surf up into the opening like in the left photo. Surf all the way up until the map change into Peridot Ward, then surf right into the opening like in the right photo below.
Surf right until you reach the piece of land like in the left photo. Then surf down until you reach the position like in the right photo.
Dive down and go right, into the small bright area like in the left photo. Resurface, then surf right and down to get to the cave entrance.
Go up the waterfall. Use Blizzard in a wild encounter battle to freeze the water. 
Land on the right side, like in the left photo. Slide left to get to the deeper area.