My team isn't the greatest. But I'm not aiming for super awesome and powerful. I want opinions on what I should replace (Pokemon or moves) or alter slightly (natures, abilities and items).
The Team:

Name: Duosion -- No held item
Level: 38
Ability: Magic Guard
Nature: Careful
Moves:
-- Shadow Ball
-- Hidden Power
-- Psychic
-- Recover
Duo is a replacement for my Reuniclus. Her Hidden Power is a grass-type move. I was hoping for a fire-type so she could deal damage to steel Pokemon.

Name: Samurott -- Mystic Water
Level: 50
Ability: Torrent
Nature: Careful
Moves:
-- Grass Knot
-- Surf
-- Aqua Tail
-- X-Scissor
I decided to start with Oshawott due to the fact that the pig thing looked creepy and I hate grass types. I taught him Grass Knot so that he could take out Ghetsis's Seismitoad so I can get rid of it for something, I just haven't yet.

Name: Scrafty -- No held item
Level: 51
Ability: Moxie
Nature: Hasty
Moves:
-- Strength
-- Hi Jump Kick
-- Crunch
-- Dragon Claw
I needed a new dark type after I found my Liepard was extraordinarily weak. Scrafty is weak to fighting (annoying, but whatever) and I tend to keep him hidden during such fights.

Name: Eelektross -- No held item
Level: 51
Ability: Levitate
Nature: Modest
Moves:
-- Thunderbolt
-- Crunch
-- Discharge
-- Flash
This guy replaced my Zebstrika due to his levitation ability. I taught him flash only because I was exploring the cave with Cobalion and the Heart Scale lady wanted to see it. It can be removed for anything.

Name: Simisear -- No held item
Level: 50
Ability: Gluttony
Nature: Timid
Moves:
-- Flame Burst
-- Cut
-- Crunch
-- Flame Charge
I don't like him. One bit. But for an early fire-type, he wasn't so bad. I plan on replacing him with an Arcanine when I get my Growlithe high enough to evolve. Unless someone has a better idea for a replacement?

Name: Zekrom -- No held item
Level: 54
Ability: Teravolt
Nature: Gentle (this makes me laugh)
Moves:
-- Dragon Claw
-- Fly
-- Zen Headbutt
-- Fusion Bolt
The only reason I have Zero on my team is because I need a high level as a back-up in case I get into a pickle. I also just like his design. I was thinking of replacing him with Hydreigon or something. Haven't fully decided yet.
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As you can probably tell, I need a bit of help. I haven't done any EV training (mostly because I still don't understand it completely, despite reading guide after guide) and I haven't taken the time to throw on some held items to them. They aren't in any particular order, due to the fact that I keep switching them around depending on the type being used. The first Pokemon on the team is usually holding an Amulet Coin or a Lucky Egg, depending on the battle (trainer vs wild).
I'm open to all suggestions, especially changes in natures and replacements. Thanks for getting this far. I'm sorry it's so darn long.
