this book was very helpful for my adventure through Kalos1 It was especially helpful when i was searching for mewtwo ( my frend had told me there was one but i didnt know where it was) and the breeding guide (beginner and advanced) was very helpful when my frend wanted my kangaskhan but i needed to breed it before i traded it so it wouldnt be "gone" but i couldnt find a ditto so the breeding guide explained that ditto would appear wherever they pleased (meaning they could be virtually anywhere!) but it also said the higher your pokemon's power level (found on the pokemon web site) the more often they will appear.