There's probably one somewhere. As a rule of thumb, if it relies on luck or manipulates the hax (the luck function in the game) it's probably a hax item. Quick Claw will make your Pkmn go first if you're lucky. Scope lens increases the chance of getting a crit. They rely on or manipulate the hax, hence they are hax items.
I'll let it slide this time, but don't use that item in the future. Just in case you have this too, since it's a popular hax item, scope lens is also illegal.
Species Clause is where you can only have one of a certain type of Pkmn, so if you have two Blastoise, somebody has to go. Hax items are items that rely on luck, so things like Bright Powder and Quick Claw aren't allowed.
Standard rules are:
Sleep Clause
Uber Clause
Hax Items Clause
Species Clause
OHKO Moves Clause
No Hacks
Sorry but I've already been challenged by someone else, but if you wait a few minutes I'll battle you once I'm done.