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This article is incomplete. Please feel free to edit this article to add missing information and complete it. Reason: Contest Pokémon, overworld Pokémon that are nicknamed, ORAS information, other possibly nicknamed Pokémon and any other missing stuff.
Some of the Pokémon owned by NPC have nicknames. Most Pokemon obtained via in-game trades have a nickname, a lot are opponents' Pokémon in the Contests, while the remaining can be interacted with by the player in the overworld.