Bug Buzz

In Pokémon ChampionsGen IV

Game

Pokémon Champions

BugSpecial

10% chance to lower the target's Sp. Def by 1.

See it in the games

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Has a 10% chance to lower the target's Special Defense by 1 .

“The user vibrates to generate a damaging sound wave. This may also lower the target's Sp. Def stat.”
In-game text, Scarlet & Violet

Sound-based: Soundproof blocks it, it hits through Substitute, and Punk Rock boosts it.Sound-based moves
Has a secondary effect: Sheer Force boosts it and removes the effect, Serene Grace doubles the chance, and Shield Dust and Covert Cloak block it.Moves with a secondary effect
Doesn't make contact: Rough Skin, Rocky Helmet and similar don't trigger.