Doesn't use legendaries?
Alakazam looks good. Metagross is a tad iffy. I advise against Gyro Ball, since it has respectable speed, so drop that for Bullet Punch, replace HArm with Pursuit, and get the +Atk. -Sp. Atk nature (I think it's Modest).
Definitely go with the Lum on Salamence. Burns and Paralyses on that thing can cripple it pretty heavily in my encounters against it. DDance and Moxie will pull through.
Use Unnerve on Aerodactyl. Rock Head has no use, currently. I do like the Power Herb Sky Attack: it's fast, furious, and lethal. However, it's not versatile. One use is all you will likely get out of it, so make it count.
That particular Sceptile is good, but you need a special attacker. Sceptile can definitely fill the role of a Special Sweeper, so do some research to make it just that. You lack something defensive/supportive, so that would be a good finishing touch. If you want more defense, go for Klefki (my personal Klefki is awesome, if anyone is interested). Prankster Iron Defense/Calm Mind will consistently save your ass. If you want more support, go with Meowstic Male w/ Prankster. Set up Dual Screens, get off some Paralysis, and if you REALLY like screwing with the enemy, you can slip Trick in there somewhere.