How to see the way nature affects stats
Heres something that might be useful if you want a Pokemon that strong in one stat. This is also a really good way to see what stat is your weakest. In Pokemon Black and White, like in Heart Gold and Soul Silver when you look at your Pokemon's stats, you'll notice that a couple of the stats seem to have a different color. Its a very slight difference and you may be able to see it only under certain light. One stat will be a red color while the other will be a blue color. If your Pokemon has a neutral nature you won't see this at all, all the stats will be the same. This color difference tells you how your Pokemon nature affects it's stats as it levels up. The red means that stat will grow stronger, while the blue means your Pokemon will not grow as quickly in that stat as it normally would.
Edited: Mar 12 2011
Added by: Ninetailed Fox Mar 7th 2011, ID#15357