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
Purrloin
Liepard
Accelgor
Swirlix
Slurpuff
Hawlucha
Nickit
ThievulUnburden
Sword & Shield
Sword & ShieldShowing Sword & Shield. Items may require trading, an event, or downloadable content.
HitmonleeTreeckoGrovyleSceptileDrifloonDrifblimPurrloinLiepardAccelgorSwirlixSlurpuffHawluchaNickitThievulSources: PokéAPI, PKHeX game records, Pokémon Showdown and Serebii.