I did cave and get the DLC.

I caught all of the Pokemon that are catch-able without trading and completed the main story line. I evolved my Kubfu into Urshifu's Rapid Strike Style form since I thought this form looks better than the Single Strike Style.

The only things I have left to do is get enough watts to fully upgrade the dojo (which is going to take forever) and find all of the lost digletts. I have around 25 left to find.