In general, Pikachu as a species are not particularly powerful, but Ash's Pikachu is an anomaly, overcoming odds in battle numerous times. In Showdown in Pewter City, it defeated Brock's Onix with an Electric-type attack when Onix was drenched in water, despite Onix being naturally resistant to electricity. In Electric Shock Showdown, Pikachu fought Lt. Surge's Raichu and lost. During a resulting hospital stay, it refused to become Raichu's equal by evolving via a Thunderstone, and in the second battle, Pikachu overcame Raichu by using its superior speed. In Pokémon Emergency!, Meowth remarked that Pikachu's power "far exceeds its evolutionary level." Ash's Pikachu has also defeated very high level Pokémon that Ash's other Pokémon were unable to, such as Dragonite and Metagross. It has helped Ash win innumerable battles and Gym and League matches.
Pikachu became the second non-legendary to defeat a legendary Pokémon in the anime after Charizard, beating Brandon's Regice in Pace - The Final Frontier, giving Ash his final Frontier Symbol.