An interview was included with the TV Anime Pocket Monsters Original Soundtrack Best 1997-2010 (TVアニメ ポケットモンスター オリジナルサウンドトラック ベスト 1997-2010) CD box set booklet and Sushi has been gracious enough to translate it for us. The interview includes some information on the composer Shinji Miyazaki as well as the background music used in the show.

Link to Interview: http://www.pocketmonsters.net/Miyazaki_Interview_Anime_OST
Link to CD: http://www.pocketmonsters.net/cd/203