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A note on Accuracy and Evasion modifiers

Every Pokemon has two other hidden "stats", if you want to call them that: Accuracy and Evasion. These two stats also have stat modifiers between -6 and +6, and their default stat modifier value is 0, like for all the other stats. These two modifiers affect the move accuracy of moves in the following manner:

Accuracy Modifiers:

-6: 33.3% (3/9)
-5: 37.5% (3/8)
-4: 42.9% (3/7)
-3: 50% (3/6)
-2: 60% (3/5)
-1: 75% (3/4)
0: 100% (3/3)
+1: 133.3% (4/3)
+2: 166.7% (5/3)
+3: 200% (6/3)
+4: 233.3% (7/3)
+5: 266.6% (8/3)
+6: 300% (9/3)

The general formula is Accuracy Percentage = 300 / (3 - SM) % if SM is negative, and (SM + 3) * 100 / 3 % if SM is positive, where SM is the stat modifier.

For the Evasion percentage, it is the same as the accuracy percentage chart, except it's in reverse, so to speak:

Evasion Modifiers:

-6: 300% (9/3)
-5: 266.7% (8/3)
-4: 233.3% (7/3)
-3: 200% (6/3)
-2: 166.7% (5/3)
-1: 133.3% (4/3)
0: 100% (3/3)
+1: 75% (3/4)
+2: 60% (3/5)
+3: 50% (3/6)
+4: 42.9% (3/7)
+5: 37.5% (3/8)
+6: 33.3% (3/9)

For a formula, the Evasion Percentage = (3 - SM) * 100 / 3 % if SM is negative, and 300 / (SM + 3) % if SM is positive, where SM is the stat modifier.

Then, the move accuracy = (Normal Move Accuracy * User's Accuracy Percentage * Foe's Evasion Percentage) %. If this number is greater than or equal to 100%, the move will hit for certain.

For a small example, if you use Stone Edge and you have a +1 Accuracy modifier (assuming the foe has a normal evasion modifier), Stone Edge will hit 80 * 133.3% * 100% = 106.67% of the time, i.e. it will always hit.

Hope that sheds some light on accuracy and evasion modifiers.