Whats Your Pokemon's Nickname?

[Saiman]

How many do you want to know about?  I used to play Gen 1, when only Nidoran had Genders....
So Rattata would evolve with the name Splinter.  Squirtle was Donatello, Hitmonlee was Leonardo and Machop was Raphael.  Since Michaelangelo often dressed as a female to distract a monster they fought, Jynx
Houndour/Houndoom  Dr. Doom.  The female version Sue Richards, since Doom had a thing for her.
Sandshrew started off as Sandy, when they got genders the male got Duncan  (Sandy Duncan was an actress)