Suicune really needs protect on the set. Hidden power fire may help against Abomasnow and Ferrothorn. So, I suggest replacing shadow ball with Protect. Also, a Calm Mind Cresselia can be a real threat to your team once it gets a CM or two under its belt. As a personal preference I usually run Crunch on Tyranitar just to take care of that annoying cress you see everywhere. You already have machamp and lickilicky to take care of opposing tyranitar and Suicune can handle them to an extent, so I think Crunch would be an excellent alternative to Low Kick. Goo luck at Regionals!