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I've been kind of mixed on this one. I'd just leave it in caps from gen 1-3 but in gen 4 I decided to use proper grammar.
On a side note, I nicknamed my Sneisel 'Schnisel' because they sounded similar. :)
Easy. I just name them by their natures. Like Sebastian for a Sassy Chimchar, and he makes me think of a butler. (Lucky Star - Konata uses Marimite Mode segment)