It shakes its head back to front, causing its antennae to hit each other and sound like a xylophone.
(From Bulbapedia)Kricketot is a bipedal, bug-like Pokémon. The majority of its body is red with a streak down its front and black cape-like marking on its back. Its head is encircled with a flat, white structure similar to a collar. A female has a bigger collar than a male. Two hard, black antennae with curled tips are connected to the head by a dark red segment. A similar dark red segment forms this Pokémon's nose, and it has small, black hands and feet. By shaking its head and rubbing its antennae together, it is able to create a xylophonic sound that it uses to communicate.
(From Bulbapedia)Kricketot is based on a cricket, who are known widely for their loud chirping songs used to attract females. It also bears the semblance of a real musician; possibly a music conductor or member of an orchestra. Its body works as a living musical instrument; its abdomen resembles one of many stringed instruments, such as a violin or lyre, and the Pokédex explains that Kriketot often topples over, causing its antennae to clack together and make a sound similar to a xylophone.
(From Bulbapedia) Kricketot is a combination of cricket, and possibly tot, derived from toddler, meaning a young child who has just begun learning to walk, and totter, referring to its tendency to fall over and stumble.