S1·E30 Heavy Medal

Spyke and Cyandog argue with each other and the two end up going their separate ways, with Cyandog deciding to join The Rockers. Determined not to show how much he misses his old Medabot, Spyke buys a Krosserdog Medabot but it just isn't the same without his old buddy. The two eventually reunite, but the turn of events leaves Cyandog's medal in Krosserdog's body, giving Spyke his old friend in a new way.