Magneton is a Pokemon that may be discovered within the Unova area. It evolves from Magnemite at stage 30, and may then be developed into Magnezone by leveling up in a magnetic area.
In Pokemon White 2, there are two methods to evolve Magneton into Magnezone. The primary is to discover a magnetic area and stage up Magneton there. The second is to make use of a Thunder Stone on Magneton.