The Nintendo 3DS Pokémon XY Official Guide Book Complete Story Strategy Guide (ニンテンドー3DS ポケモンX・Y 公式ガイドブック 完全ストーリー攻略ガイド) is now available for purchase for compatible iOS and Android devices. The apps are region locked though but there is a free trial version for Android. The iOS version was released on November 22nd, 2013 and requires iOS 6.0 and 23.5MB. The Android version was released on November 29th, 2013 and requires Android 2.3.3 and up.

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Sources: https://play.google.com/store/apps/details?id=jp.co.over_lap.xy.free and https://itunes.apple.com/jp/app/id734369603?mt=8