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All attacks used by the wielder act as if they are Normal-type—if the user is Normal-type, they get STAB, and they are always resisted by Rock- and Steel-type Pokemon and are ineffective against Ghost-types. Thunder Wave is the only status move programmed to take immunities into account (hence it not working on Ground-types), so a Normalized Thunder Wave will not paralyze Ghost-types.
This ability sucks. The users suck even more. Delcatty is the only fully-evolved Pokemon to have this, and outside of using Thunder Wave to paralyze Ground-types, there is zero reason to use this ability.
Found in Dream World