Actually Rafale can do all roles that a SU30 can do, and can do it equally good or better. Except that flankers come with additional payload and range.
Su 30 MKI is a heavy class fighter .Not suitable for a SEAD operation.And avionics of Rafale is generation ahead than the Su 30.Only 3 fighters in this world can defeat Rafale in RCS EF typhoon,F22 and F35. Pak fa and j20 is still development.