(I love having a thread about nicks!)
In my humble opinion, for the Treecko it has to be Tycho, Shade for Absol and Zenith for Bagon.
As for the others, I like human names so how about trying to get a female Torchic and naming it Ginny? Or Billy for Spoink
- I think your names should be short and easy to remember (for example I have an Emboar called Pik which is reeeeeeeeally short (But then again I have a Sigilyph named Sigurd)) so which ever way you want to go really!