Where can I find Zoom Lens in Pokemon Black?

Question

i need zoom lens because i need it to effect my pokemons power im doing this because someone told me
and it would effect my deinos power and if you how the effect works could you please tell me

thankyou!

Answer 1

in the battle subway you can buy it and in castelia city you can find it.

when this item is held by a Pokémon,
if the holder moves last, its accuracy
is increased by 20%.

-serebii