I forget but I think the only important move Doublade learns is Iron Head, but I prefer Gyro Ball anyway since Aegislash is so slow.
I evolved my Doublade right away. The move relearner gives you access to Sacred Sword, King's Shield, and a bunch of other moves right away anyway. --- "Religion keeps pressing B when we try to evolve." - pirategeorge" [3DS FC: 1934-0673-9848 (Pentao)]
That said, you already need to use a heart scale to get King's Shield and it can learn Sacred Sword in the same method, no need to wait. --- 3DS Friend Code: 0344-9443-2457, Newtown Dream Address (AC:NL): 5400-2162-1014 "Do you have the courage to ride with the devil?"