Eelektrik is an Electric type pokemon.
Eelektrik is #603 in the national pokedex, and it is an Electric type Pokemon.
You can evolve Eelektrik by using a thunderstone.
The only new one to use thunder stone is Eelektrik to Eelektross. Then you have your Pikachu/Raichu and Eevee/Jolteon.
Eelektrik does
Eelektrik - Eelektross
Tynamo evolves into Eelektrik starting at level 39. Eelektrik evolves into Eelektross by using a Thunderstone.
level 50
You can't find Eelektrik. You have to evolve a tynamo, which can be found in Chargestone Cave (it only has a 2-8% appearance rate)
Evolve it using an Thunder Stone.
I would prefer Eelektrik and Eelektross Because they have an immunity to ground (Please correct if I'm wrong, it may be another pokemon, or this is unobtainable in White).
Eelektrik, Pikachu and Eevee are the Pokémon that can evolve once you use a Thunder Stone on them.
The new Electric Pokemon introduced in Black and White are: Blitzle & Zebstrika Emolga Joltik & Galvantula Tynamo, Eelektrik, & Eelektross Stunfisk Thundurus Zekrom