I am under the impression that RBY damage bars are 48 pixels long, and all others are 96? This means that in RBY you can really only tell damage down to slightly less precision than 2% increments, and in future gens it's at just less precise than 1% increments, but I don't know if this is true or if any of the Stadium-style games allow greater precision.
Can anyone verify?
Can anyone verify?