Question

If a Pokemon has Unburden as a ability and has leftovers, will it increase their speed?

Answer 1

Not unless you get rid of the Leftovers.

ex: Use Fling to get rid of the Leftovers. Then your speed will increase.

See http://pokemondb.net/pokebase/44019/unburden-question

Answer 2

No,Because leftovers are still on The Pokemon

Answer 3

>Unburden doubles the Pokémon's Speed stat when the Pokémon's held item is lost. If there is no held item to begin with or if a held item is traded for another, Unburden will not be activated.

Source: Bulbapedia/ Unburden

You don't lose Lefties after using it, so your speed will not increase.

\m/o_o\m/