Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Lucario: change one of the priority moves to Ice Punch/dark type move/whatever. I'm not sure if you need 2 priority moves but that's something to consider. Lucario fears ground so Ice Punch can mess up a Gliscor and some other ground types.
Hydreigon: Earthquake is fine. In no situation will...
I'm a beginner to team building and built this sort of team. Double stealth rock due to tyranitar being unstable, and in case of rapid spins. Heatran Toxic & Roar to toxic everyone and protect to check moves. Roar also kills those with weaknesses to stealth rock. The rest are sweepers and...