Wailord

Wailord (Japanese: ホエルオー Whaloh) is a -type Pokémon introduced in Generation III that was known as the largest recorded Pokémon at the time. It is over 47 feet long and evolves from Wailmer. In Ruby/Sapphire/Emerald, Wailord is needed to unlock the Regi's Caves along with the help of a Relicanth. One is used by Gym Leader Marlon and Wallace in Emerald.

Appearance
Wailord is a giant blue Pokémon with small eyes and a huge tail. Its flippers or fins are blue and its underbelly is a light tan color with stripes going up and down. It resembles both a blimp and a whale.

Evolution
Wailord is the evolved form of Wailmer starting at level 40.

Trivia

 * Wailord has the highest amount of HP out of all Water-type Pokémon.
 * It also has the fourth highest HP out of all Pokémon (only to be beaten by Blissey, Chansey and Wobbuffet.
 * Wailord is the tallest Pokémon.

Origin
Wailord's name derives from "whale", the animal, and "lord", a reference to its size.