Imperialdramon: Dragon Mode (Blue)

The best candidate moving into Imperialdramon would always be [BT3-027] Paildramon, as he will not only reduce the digivolution cost by 2, but also grants an extremely useful inheritable effect to your Imperialdramon. With Paildramon as it's digivolution card, Imperialdramon can attack twice in a turn. In addition, Paildramon himself can bypass most blockers (below 6000 DP) except Cherrymon or when playing against a black blocker-based deck.

Meanwhile, [BT3-055] Dinobeemon can be useful occasionally, and usually only played for the increased base pool for moving into Imperialdramon (since he also reduces digivolution cost by 2). With <Piercing>, he can be a great candidate against blockers (again, those below 6000 DP) but most of the time Paildramon is preferred as base moving into Imperialdramon.