There is most certainly not any fountain in Dark Dawn... In fact I can't think of any mini-games at all. Does avoiding the light at the Apollo Lens with the Umbra Gear count? That is the only thing I can think of.
There was the Psynergy Training Grounds at the beginning. --- Camelot asked for your support of Golden Sun 4! http://ipetitions.com/petition/operation-sunrise/ | http://facebook.com/pages/Operation-Sunrise/371417546251291
I noticed that there was a lack a minigames during my first playthrough. I was so intrigued by the newness and story, and blazed through the easy difficulty, that I didn't really care about it. But I do miss those though; especially the slots game where you could get Mythril Shirts and Hyper Boots. --- PSN: Handsomistic1