In Generation III, a new element was introduced called Sound. While not a type, Sound is an element which is infused in various moves and abilities and has a variety of special attributes. For one, Sound-based moves will always penetrate the Substitute if a Pokémon has used Substitute. This allows for further damage to be taken. There are many moves which can be categorised as Sound-based

List of Sound-Based Moves

Name	Type	Cat.	PP	Att.	Acc.	Effect
Boomburst			10	140	100	The user attacks everything around it with the destructive power of a terrible explosive sound.
Bug Buzz			10	90	100	The user vibrates to generate a damaging sound wave. This may also lower the target's Sp. Def stat.
Chatter			20	65	100	The user attacks the target with sound waves of deafening chatter. This also confuses the target.
Clanging Scales			5	110	100	The user rubs the scales on its entire body and makes a huge noise to attack opposing Pokémon. The user's Defense stat is lowered after the attack.
Clangorous Soul			5	--	100	The user boosts all its stats by using some of its own HP.
Clangorous Soulblaze			1	185	101	This move can't be used. It's recommended that this move is forgotten. Once forgotten, this move can't be remembered.
Confide			20	--	101	The user tells the target a secret, and the target loses its ability to concentrate. This lowers the target's Sp. Atk stat.
Disarming Voice			15	40	101	Letting out a charming cry, the user does emotional damage to opposing Pokémon. This attack never misses.
Echoed Voice			15	40	100	The user attacks the target with an echoing voice. If this move is used consecutively by any Pokémon, its power is boosted.
Eerie Spell			5	80	100	The user attacks with its tremendous psychic power. This also drains 3 PP from the move last used by the target.
Grass Whistle			15	--	55	This move can't be used. It's recommended that this move is forgotten. Once forgotten, this move can't be remembered.
Growl			40	--	100	The user growls in an endearing way, making opposing Pokémon less wary. This lowers their Attack stats.
Heal Bell			5	--	101	The user makes a soothing bell chime to cure the status conditions of all its fellow party Pokémon and allies.
Howl			40	--	101	The user howls loudly to rouse itself and its allies. This boosts their Attack stats.
Hyper Voice			10	90	100	The user attacks by letting loose a horribly loud, resounding cry.
Metal Sound			40	--	85	A horrible sound like scraping metal harshly lowers the target's Sp. Def stat.
Noble Roar			30	--	100	Letting out a noble roar, the user intimidates the target and lowers the target's Attack and Sp. Atk stats.
Overdrive			10	80	100	The user attacks opposing Pokémon by twanging a guitar or bass guitar, causing a huge echo and strong vibration.
Parting Shot			20	--	100	With a parting threat, the user lowers the target's Attack and Sp. Atk stats. Then it switches places with a party Pokémon in waiting.
Perish Song			5	--	101	Any Pokémon that hears this song faints in three turns, unless it switches out of battle.
Relic Song			10	75	100	The user sings an ancient song and attacks by appealing to the hearts of the listening opposing Pokémon. This may also induce sleep.
Roar			20	--	101	The target is scared off, and a different Pokémon is dragged out. In the wild, this ends a battle against a single Pokémon.
Round			15	60	100	The user attacks the target with a song. If others use this move, they will act immediately after the initial user, and the power of their Rounds will be boosted.
Screech			40	--	85	An earsplitting screech harshly lowers the target's Defense stat.
Sing			15	--	55	A soothing lullaby is sung in a beautiful voice that puts the target to sleep.
Snarl			15	55	95	The user yells as if it's ranting about something, which lowers the Sp. Atk stats of opposing Pokémon.
Snore			15	50	100	This attack can be used only if the user is asleep. The harsh noise may also make the target flinch.
Sparkling Aria			10	90	100	The user bursts into song, emitting many bubbles. Any Pokémon suffering from a burn will be cured by the touch of these bubbles.
Supersonic			20	--	55	The user generates odd sound waves from its body that confuse the target.
Torch Song			10	80	100	The user blows out raging flames as if singing a song, scorching the target. This also boosts the user's Sp. Atk stat.
Uproar			10	90	100	The user attacks in an uproar for three turns. During that time, no Pokémon can fall asleep.

There is an ability called Liquid Voice which will turn all sound-based moves into Water-type. This is only known by the Pokémon Popplio, Brionne and Primarina.

Extra Effects By Sound

There are some other elements to Sound now. First, the ability Punk Rock will boost the power of any Sound Move used by the Pokémon with the ability.

Next, as of Pokémon Sword & Shield, there is an item that activates when the holder of the item uses Sound based moves

Picture	Name	Effect
	Throat Spray	Raises Sp. Atk when a Pokémon uses a sound-based move.

Blocking Sound

There are two ways of blocking sound. The first is by having a Pokémon with the ability Soundproof. If the Pokémon has this ability, all Sound-based moves will not affect them, including damage from it.

The Ability Punk Rock will also reduce the amount of damage received by Sound based moved by 50%.

Alternatively, Pokémon Sun & Moon introduced a new move called Throat Chop. Using this move will prevent the target from using any Sound-based moves for the next two turns.

Name	Type	Cat.	PP	Att.	Acc.	Effect
Throat Chop			15	80	100	The user attacks the target's throat, and the resultant suffering prevents the target from using moves that emit sound for two turns.