People don't use scald or lava plume for burn hax?
Morning sun is alot better. If you can't spin away the SR, morning sun can save Volcarona so many times. It survives Rotom's hydro pump after SR in the sun, so with morning sun thats another free setup for Volcarona. Also bold Volcarona in the sun is probably the most deadly pokemon in OU. (not talking about broken or any of that crap) Without using a choice scarf, only Terrakion can really check it well offensively. Stuff like Bliss / Jelli can still toxic against non rest / sub versions. Dragonite doesn't even 3HKO with LO extremespeed and gets 2HKOd by +1 fiery dance in the sun after SR. It also sets up on like more than half of OU. So stay in 1 turn and try and damage it, find you can't, and boom you are swept.