This time much better!

The book provides a number of very detailed information, the complete approach, content to the main story, all ellite Pokémon, one page lists all items, skills etc.
Much of it you probably will not absolutely need. The only flaw is the lack of all localities of hidden items (which you can track only the Item radar). Although some are mentioned in approach, but not shown on the maps. (But that was far in any game guide for Pokémon like that.)

This game guide leaves little to be desired. The second volume published in March with the entire Pokédex is really not at all necessary for most players.