After many variations, High Touch, the opening song for Pocket Monsters Diamond and Pearl will be replaced in 2010 with a new song entitled The Greatest・Everyday! (サイコー・エブリディ！！). High Touch was featured in over 50 episodes, debuting during the DP96/97 special in late 2008. The instrumental version of The Greatest・Everyday! [サイコー・エブリディ！！(インストバージョン)] has been announced on the upcoming Dotchi~Nyo? (ドッチ～ニョ?) CD. The CD will be released in Japan on December 16th, 2009.

The official Pocket Monsters Diamond and Pearl website has posted a news article about the new opening. The Greatest・Everyday! will air as part of the first new episode of 2010, DP 158 - Roaring Around! Jibacoil VS Metagross!! (爆走！ジバコイルVSメタグロス！！). The song is sung by Akiyoshi Fumie (あきよしふみえ) who is best known for singing the first Diamond and Pearl opening song, Together.

Source: http://www.tv-tokyo.co.jp/contents/pokemon_dp/news/#045004