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Deals damage and has a 30% chance to paralyze the target.
Discharge is, among those moves with 100% accuracy, the Electric-type attack with the greatest chance to induce paralysis, so is better used on more bulky sets where the benefits of the increased paralysis chance are most felt, with defensive Zapdos and Porygon2 being perfect examples. It has a reasonably good distribution amongst Electric-types, so can fill in for a STAB move, and can be used on lots of different Pokemon that also benefit from the increased paralysis chance, serving as a coverage move option for them as well. Its power is also decent, however offensive Pokemon will almost always prefer Thunderbolt for the increased power, as relying too heavily on a 30% chance rate is unwise.
Thunderbolt is a more powerful alternative with a much lower chance to paralyze.
Thunder is an even more powerful alternative, also paralyzing 30% of the time, but has an undesirable 70% accuracy under normal field conditions.
DragonBreath is a weaker Dragon-type equivalent.