This is topic Effect of X Accuracy on Pokémon? in forum Research Lab at The Azure Heights Forum.

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Posted by XxDangerxX (Member # 4141) on 11-02-2008, 12:22 AM:
The laboratory data covers the effect of accuracy-lowering attacks, but it hasn't mentioned any effects of accuracy-raising inventory items. Will such objects raise the accuracy of a Pokémon who is already at 100%, and by how much?

[ 11-02-2008, 12:27 AM: Message edited by: XxDangerxX ]
Posted by MISSINGNO. (Member # 4150) on 01-23-2009, 09:10 PM:
I think it causes the game to calculate damage as if the opponent's Evasion was one stage lower.
Posted by Face (Member # 1916) on 05-01-2009, 07:40 PM:
What MissingNo said.
Posted by Doctor Unne (Member # 4148) on 11-24-2009, 03:08 PM:
Actually, X Accuracy gives all moves Swift-accuracy. If you have X Accuracy, X Speed, and a OHKO, you can easily win any in-game battle.

Karpe Diem