Thanks for the help. It's mainly against blake and fern. So better to teach arcanine sunny day instead of morning sun (?).
I want to try to relearn flygon rock slide, only I don't have a heart scale right now (also no mining kit). Since I can't get back to reborn city at the moment I don't think I can get one.
Extra pokemon I have is a Lv. 60 Blastoise who knows surf, hydro pump, water pulse & protect