Good. I would say 6/10. You have only 2 points below max attack stat for Haxorus but your nature is bad Lonely lowers Defense which is very bad for a Dragon dancer, if you wanted an Attack boosting nature go with Adamant but I would say that Jolly is a better nature as it boosts speed. Also you should not use Outrage and Dragon-dance, go with Dragon claw instead of Outrage. Another idea would be to: Go with Adamant Nature, Give him a Choice Scarf, and give him the set: Outrage, Earthquake, X-Scissor, and Brick-break this set will do massive damage.