Pikachu Genki Dechu / ピカチュウげんきでちゅう / Pikachu Genki Dechu

No music or sound specific credits in the game's staff roll. General development staff credit provided for Ambrella:

Ain Terakawa, Daisuke Yoshimitsu, Hiroki Iwasaki, Hiroyuki Yamanaka, Masahiro Sugiyama, Miki Obata, Muneaki Ozawa, Norio Matsumura, Shinichi Sasaki, Shuira Matsumoto, Takayuki Itou, Takeshi Yaegashi, Tomoe Takayama, Watanabe Hirotake, Wataru Kawashima, Yoshiyuki Oku, Youko Murakami, Yousuke Kuroda, Yousuke Suma

However, Miki Obata does include this game in his twitter bio for games he has worked on as a sound creator.