So what do moves like Defense Curl actually do. Your Defense is rising, sure. How much?
Well, every stage a stat goes up or down changes their stats quite significantly. Each stat can go up or down beyond the unmodified number six times in either direction. These numbers represent the Pokémon's stat with each stage, compared to its unchanged value:
-6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6
1/4 2/7 1/3 2/5 1/2 2/3 100% 150% 200% 250% 300% 350% 400%
There's a pattern there. Each positive stage adds 50% to the normal value, whereas each negative stage is simply 1 divided by the value of the positive stage. This might be a good way to remember it. If you can't remember it, the most important stages are -6, -2, 0, +2, +4 and +6. Just treat the others as 'somewhere in between'.
Accuracy and Evasion are different, however. For these stats, -6 is 1/3, -3 is 1/2, +3 is 200% and +6 is 300%.
The accuracy of a Pokémon's attack (including Accuracy changes) is divided by the receiving Pokémon's Evasion to get the final check for whether the attack connects.
Pretty much all of this information is from websites like Serebii. Credit goes to them for finding out/otherwise compiling this information. I merely bring this information to any of my readers who are interested and may not know where else to look. Do check out this website for other game information.
Until next time!
-Pokéxplain
