Instructions
Go to where Route 9 and Route 10 meet in the Kanto area. You can find this area by heading east from Cerulean City or north from Lavender Town through the Rock Tunnel . You will encounter a group of Pokemon trainers that you will have to battle if you have not already. Battle each trainer and they will lead you to a small river.
Use "SURF" and follow the water down towards the grassy area. This is the Power Plant.
Walk around in the grassy area outside the Power Plant until a wild Electabuzz engages you in battle.
Battle the Electabuzz, but do not cause it to faint. Use a lower level Pokemon to consistently weaken it with small attacks.
Throw a Pokeball at the Electabuzz in its weakened state to capture it.