Keep Snorlax - it has Thick Fat and can wall Volcarona with impunity.
Emphasize that HP Rock is useful when using Volcarona in a weatherless team; the lack of Sun boost means it would require that super-effective coverage to get past Dragonite and Gyarados, as well as the Thundurus and Tornadus in the Rain. HP Rock lets Volcarona beat offensive Heatran, too, so that's another plus. It also helps against opposing Sun teams, when you don't want to miss with Fire Blast when trying to kill that Ninetales or Volcarona.
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