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Smogon wrote:

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The modifiers for Accuracy works as follows:

Accuracy Modifier Level Stat multiplier
+6 (Move Accuracy) * 9/3 (3)
+5 (Move Accuracy) * 8/3 (2.6666)
+4 (Move Accuracy) * 7/3 (2.3333)
+3 (Move Accuracy) * 6/3 (2)
+2 (Move Accuracy) * 5/3 (1.6666)
+1 (Move Accuracy) * 4/3 (1.3333)
±0 (Move Accuracy) * 3/3 (1)
-1 (Move Accuracy) * 3/4 (0.75)
-2 (Move Accuracy) * 3/5 (0.6)
-3 (Move Accuracy) * 3/6 (0.5)
-4 (Move Accuracy) * 3/7 (0.4285)
-5 (Move Accuracy) * 3/8 (0.375)
-6 (Move Accuracy) * 3/9 (0.3333)
Evasion is identical, except the chart works in reverse:

Evasion Modifier Level Stat multiplier
+6 (Move Accuracy) * 3/9 (0.3333)
+5 (Move Accuracy) * 3/8 (0.375)
+4 (Move Accuracy) * 3/7 (0.4285)
+3 (Move Accuracy) * 3/6 (0.5)
+2 (Move Accuracy) * 3/5 (0.6)
+1 (Move Accuracy) * 3/4 (0.75)
±0 (Move Accuracy) * 3/3 (1)
-1 (Move Accuracy) * 4/3 (1.3333)
-2 (Move Accuracy) * 5/3 (1.6666)
-3 (Move Accuracy) * 6/3 (2)
-4 (Move Accuracy) * 7/3 (2.3333)
-5 (Move Accuracy) * 8/3 (2.6666)
-6 (Move Accuracy) * 9/3 (3)
Accuracy and Evasion can each only reach +6 or -6. They are separate stats.

Now, here's where it gets a little tricky. Not only are the numbers much harder to work with, but the application is as well. Move accuracy is the base accuracy of the move. Accuracy of the move is easy to see, most of which are 100. There also moves like Hydro Pump or Stone Edge with 80. So if only one "hidden" modifier is in effect, you can just plug in the numbers and see how often the move will hit.

If both are in effect, you are going to have a bit more difficulty. You must use a longer formula, which looks like this:

Chance to hit = Move Accuracy * Accuracy Mod * Evasion Mod * Accuracy Item Mod *
Evasion Item Mod * Accuracy Ability Mod * Evasion Ability Mod * Gravity Modifier
The order of multiplication is currently unknown, however, which may make the calculations off by a % or two thanks to rounding. It is recommended you use the above formula though, to make sure you account for everything.

So say Tyranitar was trying to hit its foe with Crunch, but its foe had lowered Tyranitar's Accuracy to -1, and raised its own evasion to +2. Tyranitar does not have an ability that affects its accuracy or evasion, and in this instance, neither does its foe.

Chance to hit: 100% * 0.75 * 0.6
= 45%
So Tyranitar would only have a 45% chance of landing a hit with Crunch, one of its more reliable moves. Yikes!