Kricketot

“It shakes its head back to front, causing its antennae to hit each other and sound like a xylophone.”

— Pokémon Diamond

“It chats with others using the sounds of its colliding antennae. These sounds are fall hallmarks.”

— Pokémon Pearl

“Its legs are short. Whenever it stumbles, its stiff antennae clack with a xylophone-like sound.”

— Pokémon Platinum