Well you Can Pair him with a focus sash, and use a good stat boosting move like Swords dance and hone claws, and then it becomes invincible for some people, becuase it speed will grow overtime, but actually its easy to counter, just use a priority move, or trick room that bird thingy
also, Sharpedo isnt an uber because he gots low defenses and no stat boosting moves, so it will ony be fast, but no strong, and ninjask is an uber, because its an annoying batton passer, but again, trick room or priority, see ya ninjask