Are there any Pokemon that grow at a fast rate?

Question

Non-legendary, or event etc...

Answer 1

http://bulbapedia.bulbagarden.net/wiki/Category:Pokémon_in_the_Erratic_experience_group

The Pokemon in that list only require 600,000 EXP to reach LV 100.

Comments

Well, they are erratic, so they actually grow slower at beginning.
But from like level 40, it grows like a freaking lightning!