Giga Impact is a Normal type move and is sometimes considered the physical counterpart of Hyper Beam. It basically has the same stats as Hyper Beam.
The user charges at the target using every inch of its power. The user must rest on the next turn.That happens unless the move misses.
In the anime, Cynthia's Garchomp was known to use Giga Impact, Ash's Gliscor also knew how to use Giga Impact.Paul's Electivire, Lenora's Herdier, Kylie's Munchlax and Tobias's Latios know it as well as a Wild Aerodactyl and Spiritomb.