I nickname my team, depending on their cuteness they get a cute name, or or powerful names for legends.
Current exceptions:
DeathWave The Luvdisc
and CutiePie the Gyarados.
(Look, I was really tired when I finally got to that damn nickname rater!)
Sometimes I Nickname a Pokemon a different species name I made for them..
Cobalion-Athosteel (Athos+Steel)
Terrakion-Porthoston (Porthos+Stone)
Virizion-Aramiseed (Aramis+Seed)
Keldeo-D'Artaqua (D'Argatnan+Aqua)
These come from the Three Musketeers, and also something to do with the Pokemon's first type.
Reshiram-Yashiro (Yang+Shiro)
Zekrom-Yikuro (Yin+Kuro)
Kyurem-Wuhaiiro (Wuji+Haiiro)
W-Kyurem-Yanhaiiro (Yang+Haiiro)
B-Kyurem-Yinhaiiro (Yin+Haiiro)
From Yin, Yang and Wuji, what these to are based off of, and Japanese for White, Black and Grey! I think you can guess which one. B-Kyurem's is just a straight up combo of the words, but it goes with Yanhaiiro (W-Kyurem) so I'm not bothered.
Victini-Nikoal (Nike+Coal, corruption of Nichole. Yes I think Victini is a girl
)
Nicknames are a fun way of expressing your personality!