On this team, I would recomend your Sceptile being a subseeder. He's no Jumpluff (wiiiiiin), but he can do it.
Magnezone has power, but cannot sweep well. A hefty distribution of EVs in the defensive department has always been my favorite way to go along with some support moves, but isnt the best thing fot him since he has a 4x EQ weakness (and is even slower than most EQers) a weakness to the often speedy fighting and fire types (Blaziken and Infernape would have fun) but he switches in on outrage and most steels (no Metagross) well. Traping Skarm (and with HP Fire, Bronzong) has been his job up to now.
Mamoswine can't wall.
Slowbro is a fantastic tank, but takes some setup and a good knowledge of your oponents team, as Slowbro has many weaknesses. Dispite being a bulky water, being weak to pursuit sucks.
CM/Slack Off makes the 'Bro win.
Yanmega is one of my more common leads. Good choice. Scarf Moltres is something to think about though, since you lack fire, but then you'd be lacking bug...[/TooTiredToContinue]