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
AccelgorUnburden
Black 2 & White 2
Black 2 & White 2Showing Black 2 & White 2. Items may require trading, an event, or downloadable content.
HitmonleeTreeckoGrovyleSceptileDrifloonDrifblimPurrloinLiepardAccelgorSources: PokéAPI, PKHeX game records, Pokémon Showdown and Serebii.