Pokémon

Pokémon are creatures that are used for fighting, or used as pets, some people research them, others use them for horrible tasks, there are currently 718 Pokémon discovered, there's most likely going to be more discovered soon.

History
(From Bulbapedia) Pokémon have been, from the very beginning, spoken of as friends and partners to the humans of the Pokémon world, used to help with various tasks from constructing buildings to exploration. Many people in the Pokémon world take Pokémon with them on a journey to gather Badges and compete in the various Pokémon Leagues as Trainers, using them in battles against Pokémon both owned by other Trainers and found in the wild.

Uses
Some people research them, others use them for battling and sometimes, there are horrible people who use them for horrid tasks.