Every cave in Kalos is shit. Save for Reflection Cave and Terminus Cave.
Frost Cavern is located inside a mountain.. But only has three floors, no dead ends, no secrets, no alternate paths for exploring.
Glittering Cave was decent. Why they didn't use the same layout for other caves I don't know.
Connecting Cave, Chamber of Emptiness, Unknown Dungeon and Victory Road are a joke.
Why is every cave bright as day? What happened to the pitch black caves from B/W2? The light on your bicycle could have had a purpose.