Enjoying Pokémon Sun and/or Moon? You aren't alone. But as a heads up, for now, it looks like you shouldn't save in the post-game Battle Tree location or pretty much any Pokémon Center in the game, according to Polygon. Folks online are saying that doing so can corrupt your save file, and that means all the work you've done to evolve Litten into an Incineroar will be for naught. We've reached out to The Pokémon Company about a fix for this and will update this post should more information arrive. In the meantime, you'll just have to break the habit of saving after you've healed your party members at a Pokémon Center.