Why does there appear to be no "Scottish" pantheon of pre-Christian deities? After the arrival of the Romans, the influences of Christianity become clear, but there doesn't seem to be any well-known known "Scottish gods", the way that there are Norse or Roman or Greek, or even Irish.
Are you referring to the Picts who inhabited most of, what is now, Scotland? If so, as far as I am aware, no-one has yet deciphered any of their written carvings.
http://rspa.royalsocietypublishing.org/content/early/2010/03/26/rspa.2010.0041
You would probably be better searching for Pictish gods, since Scots generally became a people around the time of Christian conversion.