So when I use steel roller the beneficial effect is to remove terrain so with sheer force I can spam powerful steel roller till terrain ends? Or is the effect of like neutral or negative?
Steel Roller doesn't get a boost from Sheer Force. As a result, it removes the effect of any terrain active. So, I would consider this a negative effect because it prevents the move from being used again until terrain is set up.
Also, I tested it On Showdown!
Hope I helped!