Nodulithe

Black +2: Its ear is hexagonal in shape. Compressed underground, its body is as hard as steel.

White +2: They were discovered a hundred years ago in an earthquake fissure. Inside each one is an energy core.

Black 2 / White 2: The hexagonal-shaped hole is its ear. It has a tendency to walk in the direction the sound is coming from.

Sun: Born deep within the ground, it compares itself with similar species, such as Geodude and Carbink, to settle which has the hardest body.

Moon: The hexagonal cavity is its ear. It walks in the direction of sounds it hears, but if the sounds cease, it panics and topples over.

Ultra Sun: The hexagonal hole is its ear. Deep in that ear is an energy core, so if you stick your hand in there, Roggenrola will be very angry!

Ultra Moon: It was found in a fissure in a layer of exposed rock. The material that makes up its body is dirt from several hundred years ago.

Sword: It’s as hard as steel, but apparently a long soak in water will cause it to soften a bit.

Shield: When it detects a noise, it starts to move. The energy core inside it makes this Pokémon slightly warm to the touch.