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I usually give simple names to my Pokemon. Like Shell for Squirtle and Paws for Sandshrew.
Pink Pokemon like Corsola look like chewing gum to me though, lol, so I don't mind naming a Corsola Bubblegum.
I tend to give my Pokemon teams nicknames that fall in a certain theme. Here are seven examples:
Blastoise - Delta (Theme of nickname: Star Wars Republic Commando Squads)(Game: Blue)
Feraligatr - Galvatron (Theme of nickname: Decepticons)(Game: Soul Silver)
Swampert - Revan (Theme of nickname: Star Wars Sith Lords)(Game: Sapphire)
Empoleon - Napoleon (Theme of nickname: World Leaders)(Game: Platinum)
Samurott - Durendal (Theme of nickname: Legendary Weapons)(Game: White)
Samurott - John Rambo (Theme of nickname: Anti-heroes)(Game: White 2)
Greninja - Enterprise (Theme of nickname: World War II Ships)(Game: X)
One one game that I've played through emulators, I gave certain Pokémon nicknames in reference to real life characters and companies that fit that particular Pokémon. Among them are Bellsprout being "Ma Bell" and Ponyta being "Mr Ed".