Giving him Earthquake rather than Screech might be better. Also, you really don't need two dark moves, keep Crunch but get rid of Faint attack and replace it with something like Flamethrower.
Screech does jack crap for that moveset, as all those moves are Special Attacks and Screech lowers physical Defense. Dragonbreath=good, Quake over Screech, Protect over Faint Attack and keep Crunch. Attach leftovers
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I will destroy your soul on Brawl+
Enjoy the Smash Last Supper
Hidden Power: Rock
Earthquake
Rest
Quick Attack
@ Chesto
EVs: 252 Attack, 128 Speed, 128 HP
Nature: Adamant/Jolly
Quake to STAB whatever that needs a beating. HP Rock to beat up flyings. Quick Attack as a last resort move(if slower than opponent) before dying or to kill a dying opponent which is faster than you. *points thumb up*