Change your preferences here.
Deals damage and has a 10% chance to paralyze the target.
While this move is great for defeating Misty's Starmie, it isn't useful for much else. Ditch ThunderShock as soon as you have access to Thunderbolt or any other Electric-type move that deals decent damage.
Discharge is a more powerful alternative with a high paralysis chance.
Thunderbolt is a more powerful alternative.
Thunder is a much more powerful but less accurate alternative outside of rain.