Pokemon's First Appearance: Pokemon Red, Blue & Yellow

Articuno is obviously so high on this list for a reason. It's one of the legendary bird Pokemon, has a base stat total of 580, has good speed, power and stamina, and some powerful attacks. However, it's very weak against Rock attacks, taking four times more damage than other types of attacks. It's also weak against Steel, Fire and Electric attacks. Even legends have their weaknesses.