Which other Pokemon works best on my team?

[Hoenn_Waters]

I'm new to team-making and I've made 3 Pokemon. I need 3 more for my team.

Gardevoir@Gardevoirite
Ability:Pixilate
252Sp.A/252Spd/4HP
Modest Nature
-Echoed Voice
-Calm Mind
-Psychic
-Shadow Ball

Lucario@Life Orb
Ability: Justified
252Atk/252Spd
Jolly Nature
-Swords Dance
-ExtremeSpeed
-Shadow Claw
-Close Combat

Cloyster@Focus Sash/Lum Berry
Ability:Skill Link
252Atk./252Spd/4Hp
-Razor Shell/Waterfall
-Icicle Spear
-Ice Shard
-Shell Smash


I can't think of any Pokemon left, should I use a SkarmBliss Set? Or maybe perhaps another Special Attacker?

 

[Hiatus]

Skarmory-Blissey would definitely be a good idea, I'd say. =) If you do go with these two, you should probably consider replacing Lucario with some other Pokémon (if you don't, you'd be having two-times fire weakness), and I would personally suggest Machamp. With No Guard ability, Rest, Sleep Talk, Dynamic Punch, and perhaps Stone Edge, you should be able to cause some major havoc. If you like, you could also try either Conkeldurr or Scrafty.