I nickname all my Pokémon.
Every single one, in every game.
Current FR squad (not my final, busy breeding and I just feel too sorry for Farfetch'd to get rid of him) names are:
Charizard :sean: - Kindle
Raichu :may: - Zanira
Farfetch'd :sean: - CH'DING (bah)
Gengar :sean: - Trouble
Seadra :may: - Echo
Mewtwo - Mewtwo
Threw off my Alakazam :sean:, Brink, for Mewtwo when I caught it, but neither of them'll be with me at the end.