Rate my Ruby Team

[OmniJames]

This is for Ruby only, so no move tutor moves.

Starmie@?
Trait: Natural Cure
EVs: 252 S Att, 252 Speed
Nature: Bold
-Thunder
-Surf
-Psychic
-Ice Beam

Salamence@Leftovers
Trait: Intimidate
EVs: 252 S Att, 252 Speed
Nature: Brave
-Dragon Claw
-Hydro Pump
-Flamethrower
-Crunch

Heracross@Shell Bell
Trait: Guts
EVs: 252 Att, 252 Speed
Nature: Hardy
-Brick Break
-Megahorn
-Earthquake
-Hyper Beam

Groundon@?
Trait: Drought
EVs: Cant remeber
Nature: Careful
-Earthquake
-Solarbeam
-Fireblast
-Eruption

Slaking@Choice Band
Trait: Truant
EVs: 252 Att, 252 Speed
Nature: Adament
-Hyperbeam/Return
-Focus Punch
-? (Don't really want a third earthquake, although i do have the TM)
-?

Pokemon 6:
Zangoose (Swords Dance, Return, ?, ?)
or
Metagross (Meteor Mash, Aeiral Ace, Psychic, Rock Tomb)
or
Shedinja (Silver Wind, Shadow Ball, Toxic, ?)
or
Rayquazz
or
Latios

[Scepgatr]

I am surprised that you know about EVs, yet not about natures.

Make Starmie hold Shell Bell.
Salamence is best with Modest Nature with that moveset.

Heracross@Shell Bell
Trait: Guts
EVs: 252 Att, 252 Speed
Nature: Adamant
-Brick Break
-Megahorn
-Earthquake
-Facade

Groundon@Leftovers
Trait: Drought
Nature: Careful
-Earthquake
-Bulk Up
-Fireblast
-Ancient Power

Slaking@Choice Band
Trait: Truant
EVs: 252 Att, 252 Speed
Nature: Adament
-Hyperbeam/Return
-Focus Punch/Brick Break
-Shadow Ball
-Aerial Ace

For the last slot, the Pokémons you have suggested won't give much benefit to your team. They are basically special/physical sweepers, which you already have in abundance. Attempt in getting a few defensive Pokémons such as Milotic, Regice, Weezing or Dusclops.

[OmniJames]

The only problem is i no longer have the TM for aerial ace, and i dont think i can chain breed it. Any sugesstions for the fourth move for Slaking?

[Scepgatr]

Try the following chain:
Taillow (Lv. 34) -> Wingull -> Psyduck -> Slakoth

[Reno]

Heracross@Shell Bell
Trait: Guts
EVs: 252 Att, 252 Speed
Nature: Adamant
-Brick Break
-Megahorn
-Earthquake
-Facade

choice band on that set. choice band can be obtained in ruby from battle tower.

[pyreshade]

i dont know about more experinced players but id use metagross and substitute slaking for zangoose