So...so far this is what I'm thinking of for my competitive team:

Cloyster - Naive - Skill Link - Expert Belt
Shell Smash/Rock Blast/Icicle Spear/Rapid Spin
252 ATT/252 Speed/6 HP

Gliscore - Impish - Poison Heal - Toxic Orb?
Protect/Earthquake/Toxic/Ice Fang
252 ATT/252 HP?/6 Speed

Volcarona - ? - ? - ?
Quiver Dance/?/?/?
252 Sp ATT/252 Sp Def/6 HP

Terrakion - ? - Justified - ?
Earthquake?/Sacred Sword/Swords Dance
?/?/?

Scizor - ? - ? - ?
Bullet Punch/Swords Dance/Pursuit/?

Suggestions and help, please?