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Lol I actually lolled at your virizion's name <3 if you want to you could use hp ice over stone edge with those 4 ev's in satk and a -sdef or -def nature or something for gliscor/dragonite/chomp etc and for accuracy but then volcorona wouldn't really have anything for it, just an option of...
Well honestly, hp rock volcorona OR hp ground volcarona beat heatran unless you get a lucky crit with heatran, or it's half from rocks already without a heal move, but heatran does help vs it
Looks good to me so far, heatran rotom scizor core is one of the best core teams in the game imo, especially with a dragon. All I could really say is you could take ~20 ev's out of speed on landorus for more hp cuz max speed jolly scarf isn't needed you won't be outspeeding anything than 232...
Your team is really really fire weak, if something like a heatran comes in or an infernape comes in it'll completely tear your team up, infernape could kill most of your pokemon, and if if you switch chomp into it and it CC's you're gonna be really low, so instead of one of your steel types i'd...