Our second Generation I Pokemon slides into #8 (and yes, there will be more). Jolteon has long been an asset to my adventures, aiding me in both Red and Black 2. I don't need no fancy Fairy type Eeveelutions, I'll stick with Jolteon, thank you very much.
While Eevee has a total of 8 (8!) evolutions, there are none that even come close to this guy (Vaporeon and Umbreon are pretty cool though). He is the perfect complement to my Charizard during my first runthrough of Red (takes out those pesky water types), and a heavy hitter in his own right.
The design is pretty simple, but I think that adds a lot to this Pokemon's charm. With great moves like Thunderbolt, Signal Beam, and Volt Switch, you really can't go wrong with Jolteon.