Going mono Bug type. Single mostly. So here we go with this mess:
1)Scolipede (Fish bait)
@Black Sludge
Ability: Speed Boost
Nature: Calm
IVs: I forgot, +Def +Sp. Defense, +Speed
EVs: 252 Def, 100 Sp. Def, 152 Speed.
Moves
Baton Pass
Protect
Swords Dance
Substitute
Role: Stalker, Bait
Fish bait here will boost Megacross' Speed to make it a sweeper. It sets up 2 Swords and a Sub. Then it Baton Passes to Heracross/ other physical attacker. The problem is: It has to survive.
2) Heracross (.35Calib)
@Heracronite
Ability: Swarm -> Skill Link
Nature: Adamant
IVs: Except Special Attack
EVs: 252 Attack 100 Defense 100 Sp. Def 52 Speed
Moves:
Bullet Seed (125 power, 100 accuracy!!!)
Rock Blast
Pin Middle
Close Combat.
Role: Mega, Scolipede Boosted Sweeper.
After Fishbait Baton passes, the Sub will take care of any threat to Megacross (except Talonflame). It Mega Evolves and Boom! Takes out any threat.
3) Volcarona (Fusion Bomb)
@ Focus Sash
Ability: Flame Body
Nature: Modest
EVs: 252 Sp. Att 252 SPD
IVs:
Moves:
Fiery Dance
Bug Buzz
Psychic
Rage Powder in Doubles and Triples.*
Role: Special Sweeper
If things go wrong, Fusion takes care of this. Scolipede could throw in some speed and a Sub. This makes it wreck non special walls. These moves will destroy them.
I have Pinsir and planning on Sci or. GTG will edit post later
I have some experience on monotype, but only with Smogon's format (Was top 5 in the ladder for a while in showdown), hope this criticism still helps.
First of all, you need to consider you will see flying in monotype, a lot. And with flying, comes one of Bug's most feared predators, Skarmory.
Skarmory will wall most of your valid team members (Or outright kill them with Brave Bird) and whirlwind away your Scolipede after setting up Stealth Rocks without much issues.
Lastly, not only Skarm can pull this off, you will often will just be taunted/whirlwind'd or roared out of the way.
So for this, you can not simply slap a batton pass and a couple focus sashes in a team and expect it to work.
I would recommend adding:
Forretress
252 HP/ 252 Def or Sp.Def
Stealth Rock (A must in this tier)
Rapid Spin (Mandatory, your bugs get destroyed by rocks)
Volt Switch (You need U-Turn for offensive initiative, since bug can't really go defensive)
Or
Scizor (You can go without mega-evolving but you loose a lot of bulk)
252 HP/ 252 Def or Sp.Def
Defog (Same or even better as rapid spin)
Roost (Longevity)
Bullet Punch
Knock off or U-Turn
Both are highly resistance and can often pull of a defog/rapid spin and save your team from rock annihilation.
Now that we have that out of the way, we continue with Scolipede.
Instead of using that spread, I suggest going for 252HP and 252 Spe. That way you avoid getting hit by scarfers. (Since you lack Iron Defense).
Also, keep in mind that since you are not carrying Iron Defense or Focus Sash, Scolipede will easily get fainted before he can do much besides passing speed (And therefore, any wall will cripple Heracross/Volcaronoa)
Now, while getting bulk to Heracross seems nice at first (Considering you don't need speed investment with scolipede) you can't simply give all your hopes to scolipede passing the stats.
For that, i suggest:
252 Atk. / 252 Spe.
You can go full bulk as well (252HP/252 Atk) but you will have troubles outspeeding walls with speed investment.
And while bullet seed seems appealing as well for taking care of pesky bulky water times, often running substitute instead can save heracross'es life.
And if you don't like Heracross speed, you can always use Beedril, that while it isn't as strong, it is way faster and has access to U-turn. (Not to mention it easily handles fairy pokemon)
Next, Volcaronoa:
Either go timid, or invest on the much needed bulk.
One of Volcaronoa's qualities is that with some bulk, it alone can sweep certain teams that depend too much in special attackers, (Poor Mono Electric ) so it is recommended you invest in its HP/Defense to allow it to survive hits.
Or instead, you can choose to go timid, and avoid getting hit by choice scarf stone edges. (Focus sash will save you while setting up, but wont save you from a choice scarf hit or a strong priority move)
As for psychic, I would recommend dropping it and going for giga draing, or HP ground. While HP ground seems weird at first, its a really good option for heatran, and pretty much ensures an insta-win against mono steel after rocks (If you are running bulk, if not bisharp + Scizor take care of you)
Now, If you are looking for extra team members, I recommend using Genesect as glue (I haven't played in a while, but Im pretty sure he is not banned in mono-bug anymore)
Genesect (Choice scarf)
252spe/252 sp.atk
Ice Beam
U-Turn/Bug Buzz (Bug buzz utterly destroys Mono-Dark and Mono-Psychic)
Thunderbolt
Flamethrower
As for your talonflame problem, (He is banned on monotype, but you will still see it a lot in wi-fi) you have very little options.
More often than not you will need to hope he kills itself with recoil (Forcing him to attack instead of roosting) or using gimmicky pokemon like armaldo.
Hope these suggestions help a bit, regardless of what tier you end up choosing.