Okay i just like came up with this team and would like your opinions and maybe if you'd like to recomend anything else such as certain nature and pokemon and ect...
Okay:

Swampert : water/ground
Hydreifon : dark/dragon
Volcarno : bug/fire
Breloom : grass/fighting
Metacross : steel/phychic
Snorlax : normal

yes that seems quite good, but you have no flying type? unless your intentions are to have hydreigon learn a flying type move? or volcarona? but yeah that seems like a good team, lots of type coverage :)