You may wish to consider spending a bit more time training each of them every day. For your vulpix, growlithe, and flareon, this is a great way to release pent-up aggression in a constructive manner, especially if you also train them to focus their negative energies into their attacks. You may also consider some team building exercises, such as double-battling or joint-training. This can be done either by pairing your other pokémon with your quilava (which will help him integrate into your team) or with each other (which will help reinforce what it means to be on a team in the first place). Finally, see if you can communicate how destructive behavior—including bullying and literally destroying your home with fire—is affecting not only your quilava but your family as a whole. It’s possible that if you speak clearly but firmly like a loving parent, your pokémon will understand.
If all else fails, training will of course help your quilava to get stronger, and it can learn the rock-type move Rollout naturally, just before evolution. Just as a thought.