You'll need to use a Thunder Stone on a Elektrik.
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It doesn't evolve through levels use a thunderstone
elektross
Tynamo evolves into Elektrik at level 39. Elektrik evoles into an awesome Elektross with a thunderstone which can be found in Chargestone cave.
Tynamo will evolve into Elektrik will evolve into Elektross with a thunderstone in Pokemon White.
Tynamo evolves at level 39 into Electrick and then give the Pokemon a thunderstone(you can get the thunderstone on the top floor of the shopping center on route 9, (a man gives it to you) and it evolves into a Elektross.