Manectric first appeared as an Electrike in The Electrifying Savior! when Lexi and her friends were on Route 110, traveling to Mauville City. She and her friends stumbled upon Team Aqua who were abusing multiple Pokémon for fun. Despite their attempts to break free the Pokémon, they were unable to which led to Electrike jumping out of the bushes and saving the Pokémon from Team Aqua. However, in his rescue mission he was hit by one of the Team Aqua members, leading Lexi to help him and take him with her to save the remaining Pokémon. After waking, Lexi asks for Electrike's help to save the Pokémon, which it does so. After thanking him and watching him walk away, Lexi caught up with Electrike and asked him to join her, which he did so happily. Electrike was determined to be a great asset to Lexi's team and showed much potential with battling.
As time progressed, Electrike and Lexi expressed their joint desire for him to evolve into Manectric. Electrike was used more regularly following this, eventually evolving just after the earthquake at Mt. Pyre.
Upon evolution, Manectric became one of the strongest Pokémon on Lexi's team.
As an Electrike, he was an affectionate Pokémon who liked to make people happy. He was constantly hyperactive and always cheerful, even if in peril or facing a loss. He seems to have a genuine passion for battling, not caring if he wins or loses, as long as he's battling.
Upon evolution, Manectric became much more mature and less playful, but attained his affectionate side. He also became fiercely protective of both Lexi and her other Pokémon.
Manectric discharges electricity from his mane, which creates thunderclouds overhead to drop lightning bolts. He stimulates his own muscles with electricity so he can move quickly, and uses it again to recover himself.