Speed is doubled on held item loss; boost is lost if it switches, gets new item/Ability.
Pokémon with Unburden
Hitmonlee
Treecko
Grovyle
Sceptile
Drifloon
Drifblim
Hawlucha
Sneasler
Shroodle
GrafaiaiUnburden
Scarlet & Violet
Scarlet & VioletShowing Scarlet & Violet. Items may require trading, an event, or downloadable content.
HitmonleeTreeckoGrovyleSceptileDrifloonDrifblimHawluchaSneaslerShroodleGrafaiaiSources: PokéAPI, PKHeX game records, Pokémon Showdown and Serebii.