Evolve those 2, i don't think Meowstic will be very useful besides only Fake Out at first turn, so try to get another dark. The current mon that should be available is Scraggy, try to train it and get it's ability to Moxie. Or if you don't like Scrafty, i agree with @Wolfox. Or..... if you don't like to bring 2 dark mons, you could always challenge yourself against Shade with ghost pokemon ( Ghost vs Ghost, you know what i mean ).