You can only get midfielders (not attacking or defensive) as dribbers normally, but sometimes you get the old bizarre player with an odd SA generated. So if you want an aatcking midfielder to have dribbling, you will need to either train an attacking midfielder a midfield position or a midfielder trained a attacking midfield position and then train the dribber SA. Yes sometimes you can get AML/ML or AMR/MR dribbers generated.