Im pretty new for this stuff so I really need help to get started. I have studied some forums and learned this and that, but still got lots to learn. I havent decided many of the items so suggestions are very welcome. You can also shout your suggestions for moves and anything you like, and please tell my the biggest mistakes here. I´m also aware of changeing some of these pokes if you just give me good reasons and the possible newcomer.

Mamoswine@Focus sash
Adamant
252Atk 252Spe 4Def
-stealt rock
-ice shard
-earthquake
-endeavor
The stealth rocky lead.. Also type coverage, keeping dragons in mind..

Salamence@life orb
Naive
16Atk 252Spe 240SpA
-draco meteor
-outrage
-fireblast
-earthquake

Gengar@???
Timid
252SpA 252Spe 4SpD
-shadow ball
-focus blast
-thunderbolt
-sludge bomb
Special attacker.. Type coverage again.

Metagross@???
Adamant
252Atk 112HP 12Def 132Spe
-agility
-meteor mash
-earthquake
-thunder punch or explosion
Another physical killer.. Agility for its poor speed, late game mostly.

Milotic@Leftovers?
Bold
252HP 252Def 4Spe
-recovery
-toxic
-hydropump
-safeguard
Walling toxic user. No status stuff effected, recovers when needed and a chance to attack directly if must.

Bronzong@light clay
Relaxed
252HP 152Atk 8Def 96SpD
-reflect
-light screen
-gyro ball
-explosion
Mirror effect passer. After setting up mirrors, explodes, and hopefully kills the opponent. Then the stage is set for dragonite or metagross mostly, because the need to brace themselves with a boosting attack. No-one else is hurt from 1/2 other sided damage either.
Im not sure if I would replace gengar with starmie (surf, thunderbolt, ice beam, recovery), but that would be just my preference to starmie (wich isnt so important compaired to effectiveness in team). Starry would be more durable, but gengar has those good immunitys though..
Thank you in advance.