Question

This is my second RU team, I think I deleted the first one so here is my brand new RU team :D I am new to RU, so this team might be bad :/

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Steelix (M) @ Leftovers
Trait: Sturdy
EVs: 252 HP / 56 Def / 180 SDef
Careful Nature (+SDef, -SAtk)

• Stealth Rock
• Earthquake
• Gyro Ball
• Toxic

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Bouffalant (M) @ Choice Band
Trait: Sap Sipper
EVs: 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)

• Head Charge
• Earthquake
• Stone Edge
• Superpower

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Sigilyph (F) @ Flame Orb
Trait: Magic Guard
EVs: 252 HP / 140 Def / 116 SDef
Bold Nature (+Def, -Atk)

• Cosmic Power
• Psycho Shift
• Roost
• Stored Power

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Dusknoir (M) @ Leftovers
Trait: Pressure
EVs: 252 HP / 196 Def / 60 SDef
Careful Nature (+SDef, -SAtk)

• Will-O-Wisp
• Pain Split
• Shadow Sneak
• Substitute

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Electivire (F) @ Life Orb
Trait: Motor Drive
EVs: 252 Atk / 4 SDef / 252 Spd
Adamant Nature (+Atk, -SAtk)

• Wild Charge
• Cross Chop
• Ice Punch
• Earthquake

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Omastar (M) @ White Herb
Trait: Shell Armor
EVs: 4 Def / 252 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)

• Shell Smash
• Surf
• Ice Beam
• Hidden Power [Grass]

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Answer 1

Your team kinda hates Taunt right now. I would actually suggest swapping out Sigilyph or Duskoir (Dusknoir if you don't mind having two Pokemon of the exact same type on your team) for Natu. Or Archeops, whichever one works best for you.

-Natu has the benefits of being able to directly counter Taunt and throw it back in the face of the opponent. However, some Taunt users (such as Drapion) will easily laugh at this and strike back.
-Archeops deals with Taunt in just hitting incredibly hard and not caring about Taunt. However, Stealth Rock causes it some grief, due to your not having a spinner.

You can also consider an Expert Belt on Electivire instead of a Life Orb. Because Life Orb+Wild Charge takes down Electivire a lot quicker than I would like, also making it bait for priority. Since it has a fair amount of SE coverage, you can still get powerful hits.

And also consider Seismic Toss over Substitute on Dusknoir. In my experience the reliable damage it gives makes up for not having Sub-Split.

Other than those few suggestions this team is good. Even without these suggestions the team is good.