Sound-based moves are a group of moves generated via sonic vibations (or via some form of sound). Pokémon with the ability Soundproof are immune to these kind of moves (with a few exceptions).
“ Hyper Voice Battle Data Affected by Contest data Pokémon Contests (RSE) Super Contests (DPPt...Hyper Voice
“ Howl is a Normal-type move. When used, the Pokémon howls loudly to raise its attack. It was a...Howl