"Jolteon's cells generate a low level of electricity. This power is amplified by the static electricity of its fur, enabling the Pokémon to drop thunderbolts. The bristling fur is made of electrically charged needles."
The electric Jolteon is one that is not to be messed with. In fact, it's stated in the games and anime that those barbs on its body are very sharp, and just touching them can get you hurt. But, if you look beyond that, it's a pretty powerful Pokemon to have on your team.
Jolteon's Basic Attack is Thundershock, while its Special Attacks are Discharge, Thunderbolt and Thunder.