Rate My Mono Bug Team

Question

So, this mono bug team has seen some relative success, but I feel like it could do better. Originally I had a Galvantula instead of Yanmega, but sticky web doesn't go well with Forretress' Gyro Ball.

Beedril@Beedrillite
Ability:Swarm
EVs: 252 Atk/252 Spe/4 HP
Nature: Jolly
Moves:
Poison Jab
Drill Run
X-scissor
Protect

Yanmega@Choice Specs
Ability:Speed Boost
EVs: 252 Sp.Atk/252 Spe/4 HP
Nature: Timid
Moves:
Air Slash
Bug Buzz
Giga Drain
Ancient Power

Volcarona@Leftovers
Ability:Flame Body
EVs: 72 HP/252 Sp.Atk/184 Spe
Nature:Timid
Moves:
Quiver Dance
Fiery Dance
Giga Drain
Bug Buzz

Scyther@Eviolite
Ability:Technician
EVs: 252 Atk/16 Def/16 Sp.Def/216 Spe
Nature:Jolly
Moves:
Bug Bite
Aerial Ace
Swords Dance
Roost

Armaldo@Assault Vest
Ability:Battle Armor
EVs: 184 HP/216 Atk/56 Def/52 Sp.Def
Nature:Careful
Moves:
X-Scissor
Rock Slide
Earthquake
Knock Off

Forretress@Leftovers
Ability:Overcoat
EVs: 252 HP/252 Sp.Def/4 Def
Nature: Sassy
Moves:
Gyro Ball
Volt Switch
Rapid Spin
Stealth Rock

Answer 1

Yanmega: Replace ancient power with hidden power ground to cover rock, electric, fire, and steel.

Volcarona: At +1 speed from quiver dance, speed is still critical. Give it 4 Def/252 SpA/252 Spe Timid.

Scyther: Another physical attacker that's 4 times weak to rock won't help your team. I suggest you replace it with this Heracross set.
Heracross @ Choice Scarf
Ability: Moxie
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
-Close Combat
-Megahorn
-Knock Off
-Stone Edge
Send it out late-game, preferably after all your opponents are weak to one of its attacks. Its choice scarf and speed investment make it hard to revenge-kill, and moxie makes it more and more unstoppable as it sweeps. Close combat and megahorn are STAB attacks. Knock off covers psychic and ghost, and stone edge covers fire and flying.

Armaldo: If you want a good rock Pokemon, replace Armaldo with Crustle.
Crustle @ Lum Berry
Ability: Sturdy
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
-Shell Smash
-Rock Slide
-X-Scissor
-Earthquake
Use shell smash until it takes some kind of damage (sturdy gets broken). If the opponent has some other way of breaking sturdy, you may want to use it once or none at all. Rock slide and x-scissor are STAB, and earthquake covers rock and steel.