My son is a big Pokemon fan so I've become one as well, and we love these guidebooks. Wouldn't play the game without them because they offer so much useful information that you could miss just playing the game straight through on your instincts.
This volume isn't the walkthrough, though. It's the second in a two-volume set and is basically a big Pokedex reference guide. It has all the information about all the Pokemon you could ever need to know. We really like it and use it a lot, especially for looking up what level a certain Pokemon will level-up at and what moves that Pokemon might lose access to or delay getting if he levels up too soon etc. Sometimes you want to delay evolution for strategic reasons to build a stronger Pokemon. This book helps you know when that's the right thing to do, and much more!
Buy Volume 1, though, if you want the game walkthrough.
