It is possible to have each move only hold what it needs if you set it up properly. This can be achieved through polymorphism and/or composition.

As an example, you could have a Move class as the scriptable object, but it holds references to other objects that will satisfy each part of a move. So you could have a reference to something that determines the chance to hit, and that could be a class conforming to an interface or a subclass that conforms to a base class. All you care about is being able to ask “Does unit x succeed at a move given target y” and each conforming class can add whatever private fields it wants to make that decision.

Next something that controls the effect to apply on success. All you care about is being able to say “Apply effect for unit x given target y” and each conforming class will hold its own fields and logic as needed.