Pokemon's First Appearance: Pokemon Gold, Silver & Crystal

Ok, so we lied: Umbreon is totally on here. (We have to make this list somewhat suspenseful!) Why is Umbreon the supreme leader of the other -eons? Well, it can learn attacks that each -eon is weak against. That's right: it can learn Mud Slide (a Ground attack that would be unpleasant for Flareon and Jolteon), Zap Cannon (an electric attack that would turn Vaporeon into fried catfish) and Faint Attack (a Dark attack that Espeon wouldn't be able to handle too many times). Umbreon also has a 525 base stat total, has the best power, speed and stamina of the -eons, and is only weak to Fighting and Bug attacks. Congrats, Umbreon: you've earned it.