What would make a good 6th to round out my team? The other 5 are non-negotiable, but what should I do to improve their movesets? I'm going to tackle the HG rematches for the Elite 4 and then go after Red.

>Slowking
Ability: Own Tempo
-Psychic
-Nasty Plot
-Grass Knot
-Surf

>Snorlax
Ability: Immunity
-Rest
-Sleep Talk
-Earthquake
-Body Slam

>Honchcrow
Ability: Super Luck
-Night Blade
-Dark Pulse
-Nasty Plot
-Fly

>Dragonite
Ability: Inner Focus
-Aqua Tail
-Thunder Punch
-Dragon Dance
-Dragon Rush

>Scizor
Ability: Technician
-Pursuit
-Iron Head
-X Scissor
-Brick Break