The electrizer is at valley windworks behind the fence but to get there, you have to surf from the bridge.Or you can find wild electabuzz on route 222 with a 30% chance to find them and a 50% chance to have them hold it.
You should be able to find around Valley Windworks and on wild Elekids.
here's a visual aid to help you if you require more. http://www.youtube.com/watch?v=JkLpPP-KGCU
