Nearing Olivine City, our heroes notice a field full of windmills. Brock explains the windmills are used to generate electricity. Deciding the breezy windmill field is a nice place to take a break and get some fresh air, our heroes release their Pokémon from their Poké Balls and begin to set up a picnic. When Ash and Chikorita go looking for firewood, they stumble upon a concrete building with the front door wide open. Curious, the duo enter and are promptly locked in when a strong gust of wind shuts the heavy electric door. Hearing Ash's cries for help, Pikachu races towards the building, followed by Brock and Misty. While Brock contacts the electric company for help, Ash decides to descend the floors of the compound and locates the building's power source. He and Chikorita must battle their way through the scores of security systems in place... Electric-type Pokémon!
S4 | Episode 38
The Poké Spokesman