The Electirizer is an item introduced in Generation IV that evolves Electabuzz into Electivire when trade. This item can be sold for 1050 Pokédollars.
They are sometimes held by wild Elekids and Electabuzzes. In Pokémon Platinum, an exclusive location for the Electirizer was found in the Valley Windworks while in Pokémon HeartGold and SoulSilver, it is found in Cerulean Cave. It is a box filled with electric energy and has a socket which allows Electabuzz to plug in to it.
B2W2: Team Plasma's boat.