Rate This Team - PLEASE!!!

[PKM Master]

Hello everyone! I'm new here but I've been playing Pokemon since my first one which was Yellow. I'm not really a master becasue I need a bit of help. I just want people to rate my team, they're all level 100, but I just wanna see if I've got the balance right, I don't really know who is a sweeper, tank etc. This is from Pokemon Ruby:

Note - I have 2 Slakings

Slaking @ Leftovers - Hardy Slaking @ Leftovers - Bold
Hyber Beam Hyper Beam
Earthquake Shadow Ball
Ice Beam Brick Break
Slack Off Slack Off

Metagross @ Leftovers - Calm
Earthquake
Meteor Mash
Psychic
Light Screen

Salamence @ Leftovers - Hardy
Double Edge
Earthquake
Flamethrower
Dragon Claw

Milotic @ Leftovers - Modest
Hydro Pump
Surf
Ice Beam
Recover

Tyranitar @ Leftovers - Timid
Hyper Beam
Earthquake
Crunch
Rock Slide

Venusaur @ Leftovers - Gentle
Frenzy Plant
Solarbeam
Body Slam
Sunny Day

If any changes to the list are suggest, my other L100 non legendary's are Ludicolo, Swampert, Blaziken, Sceptile, Houndoom, Ursaring, Misdreavus, Ampharos, Snorlax, Arcanine, Blastoise and Charizard.