Stimulator Royal. The ultimate temptation for a hungry trout, the Royal Stimulator in typical Royal coloration is just a fantastic dry fly. This is a multipurpose dry fly suitable for use as a high floating indicator, and the bonus is that this visual delight catches fish. How many times have you worn yourself out on a slower day only to find the fish rise time after time for your strike indicator, well this time you can put a bend in your rod hopefully with a trophy fish.