The Thundersmack was a weapon that generated storm clouds which shocked nearby enemies with bolts of lightning. Clouds generated by other team members' Thundersmacks combined into a bigger, more powerful cloud. The cloud would turn into a tempest strong enough to kill a Gravoid Brute. The elite version is shooting one cloud will make 6 six clouds circling the ground,dealing even more damage.
The Elite Thundersmack is the upgraded version of the Thundersmack. It not only had more lightning power but also had 5 little pieces of thunder storms near the thunder storm you launched making it powerful.
Ratchet & Clank: Full Frontal Assault
The Thundersmack later changed appearance. It deployed a beacon that generated clouds via a glove.
Behind the Scenes
In the Ratchet & Clank movie, when invading the Starship Phoenix, Clank ultimately defeats Victor Von Ion by rusting him up with a rainstorm created by a Thundersmack; it had no effect on Clank due to him being waterproof.