What exactly did Littlefoot see as he watched the Rainbow Faces leave?

After discovering a strange rock in the secret caverns which later got hit by an asteroid, Littlefoot and his friends and all the dinosaurs in the world were sent into the future. The world of Pokemon. Join Littlefoot and the others as they go on a journey with Ash Ketchum and help him achieve his dream of becoming a Pokemon Master. Smart Ash. Aura Ash.

Stumbling upon the Great Valley, Grovyle the Thief befriends struthiomimus brothers Ozzy and Strut, joining in on their ways of egg stealing. Can Rose convince him that they are only using him for their own selfish desires, or will all be too late?