Question

The question says it all.

Answer 1

It doesn't actually lower accuracy, It actually raises your evasions by 10%,
It works a bit like double team.

Answer 2

It raises the evasion by 10%

SOURCE
http://bulbapedia.bulbagarden.net/wiki/In-battle_effect_item

http://www.smogon.com/dp/items/brightpowder

Comments

Why did you answer 6 mins after the 2nd answer? With the same info and link.

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actually i hid my answer XD

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I was talking about kangmins answer ;) I liked your link though in your hid answer, also this shouldn't of been downvoted who ever did it vote it up.

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i no i liked the link to. I did it to troll people

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or.... because before i answered i wanted to copy that gif and forget to copy my link to support my answer so......