Electrode locations — where to catch

In Paldea (Scarlet & Violet)

• Dalizapa Passage — Walk
• West Province (Area Three) — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Cerulean Cave — Walk
• Team Rocket HQ — Static Encounter, Walk

In Hoenn (Ruby, Sapphire & Emerald)

• New Mauville — Static Encounter, Walk
• Team Aqua Hideout — Static Encounter
• Team Magma Hideout — Static Encounter

In Kanto (FireRed & LeafGreen)

• Cerulean Cave — Walk
• Cinnabar Island — Trade
• Kanto Power Plant — Static Encounter

In Johto & Kanto (Gold, Silver & Crystal)

• Team Rocket Base — Static Encounter

In Kanto (Red, Blue & Yellow)

• Cerulean Cave — Walk
• Cinnabar Island — NPC Trade
• Kanto Power Plant — Static Encounter

Other games (5)

• Legends: Arceus (Gen 8): Kanto
• Let's Go, Pikachu! / Let's Go, Eevee! (Gen 7): Kanto Power Plant
• Ultra Sun / Ultra Moon (Gen 7): Team Rockets Castle
• Omega Ruby / Alpha Sapphire (Gen 6): Team Aqua Hideout, Team Magma Hideout
• X / Y (Gen 6): Friend Safari, Lost Hotel

Electrode — full Pokédex entry