Hadron Engine creates the effect of the move Electric Terrain on the battlefield as soon as a Pokémon with Hadron Engine enters the battle. The Electric Terrain lasts for five turns, but this can be extended to eight turns if the Pokémon is holding a Terrain Extender.
Hadron Engine also boosts the Pokémon's Special Attack stat by roughly 33% (or more precisely, by a factor of 5461/4096) on Electric Terrain, and this boost applies even if the Pokémon is not grounded.
Hadron Engine displays a message when the Pokémon enters the battle, even if Electric Terrain is already active. However, if Electric Terrain is summoned while a Pokémon with Hadron Engine is already in battle, no message is displayed (unlike Quark Drive).
Skill Swap fails if either Pokémon has Hadron Engine. Trace can copy Hadron Engine. Role Play, Entrainment, and Doodle all fail when used on a target with Hadron Engine. Hadron Engine is affected by Simple Beam and Mummy.
