Digimon Frontier: Revival of Ancient Digimon (2002)
Original title: デジモンフロンティア 古代デジモン復活！！
Digimon Frontier: Revival of Ancient Digimon is a 2002 Japanese-language animation movie directed by Takahiro Imamura, with a running time of 40m. It stars Junko Takeuchi, Hiroshi Kamiya and Sawa Ishige.
Takuya Kanbara, Koji Minamoto, J.P. Shibayama, Zoe Orimoto, Tommy Himi, Bokomon, Neemon ride a Trailmon (Ball) through a desert when they get caught in a battle between human and beast Digimon. It is interrupted by the Lost Island, an island trapped between dimensions, crashing down between them and scooping all involved up.
Official site
http://www.toei-anim.co.jp/movie/2002_summer/digi_outline.html