I must be high, but on Smogon it says Zoom lens boosts your accuracy by 30% if you move last.
http://www.smogon.com/bw/items/zoom_lens
But several other people and websites says that Zoom lens boosts your accuracy by 20%
An example would be here on serebii
http://www.serebii.net/itemdex/zoomlens.shtml
I don't know what to believe anymore, can somebody help me?
Smogon screwed up, it's 20%.
http://bulbapedia.bulbagarden.net/wiki/Zoom_Lens#Zoom_Lens
Zoom lens has a boost of 20%
Source: http://www.gamespot.com/pokemon-black-version/forum/wide-lens-zoom-lens-does-1-boost-accuracy-more-than-the-other-would-it-work-w--59261402/
Effect: Boosts the holder's accuracy by 20% if the holder moves after the foe. Boosts critical hit ratio if the holder moves after the foe. - Bulbapedia
Source It's very rare that Bulbapedia is wrong.