A follow-up to the Pokemon-esque game is coming to Japan in 2010.
http://www.nintendoworldreport.com/news/24009
Super Kasekihorida, a sequel to Fossil Fighters, is coming to Japan before the end of the year courtesy of Nintendo and developer Red Entertainment, according to the latest issue of CoroCoro Comic.
Fossil Fighters, released for the Nintendo DS in Japan in 2008 and in North America the following year, featured gameplay similar to Pokemon. The game, whose title translates to Super Fossil Fighters, appears to be similar to the previous title.
Red Entertainment was recently responsible for Nostalgia, an RPG published by Ignition that was released in North America last fall. They also co-developed Lords of Thunder, the celebrated TurboGrafx-CD shoot-'em-up, which is also available on Virtual Console.
Super Kasekihorida is set for a release in Japan this year. A North American release has not been announced.