So I personally don't think Talon should be banned. In my opinion there are 4 things that are centralizing that have to be built around, and imo none are broken. These are FakeTurn, Scarf setup or DD mons, Flinchax, and priority (Talon being the forefront here). Linked is a very offensive meta, and while it is centralized, it's not just around Talon. Talon keeps the variety of Scarfers from overwhelming the meta, and no, Ditto does not do this--it can only speed tie. Talonflame can easily be beaten if you build and play correctly, and I can say I've never been swept by Talon (hell, the max number of kills it got was 1 lmao and I don't use Tran, MegaBro, Rotom-W, or a Rock type).
How to beat Talonflame:
Rock-types: They resist both its STABs, are generally physically bulky, and can KO back with their Rock STAB. The best would probably be Tyranitar (252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 248 HP / 252+ Def Tyranitar: 118-139 (29.2 - 34.4%) -- 100% chance to 4HKO after Leftovers recovery OR 252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 252 HP / 4 Def Tyranitar: 162-190 (40 - 47%) -- guaranteed 3HKO if bulky offensive set), Rhyperior (252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 248 HP / 0 Def Rhyperior: 139-166 (32.1 - 38.3%) -- 1.5% chance to 3HKO after Leftovers recovery), and Mega Diancie (Mega Diancie needs a safe switch in though, as it usually doens't invest in defenses and takes 67.2 - 79.6% damage uninvested). While the first two dislike burns, they can still oneshot Talon with Stone Edge. And no, Ground Natural Gift (which is the best one imo so you hit Tran) doesn't do much. It only does around 40% to TTar and Rhyperior has Solid Rock. If you run Grass, Water, or Fighting, that leaves you walled by other Pokemon instead. 252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 0 HP / 4 Def Relicanth: 139-165 (40.7 - 48.3%) -- guaranteed 3HKO RELICANTH OP PLZ NERF Kabutops can also tank Talonflame's attacks and hit it hard with SD+Waterfall/Stone Edge or Stone Edge+Waterfall, outspeeding WoW in Rain. Regirock also exists and tanks Talonflame's hits all day (252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 252 HP / 252+ Def Regirock: 76-90 (20.8 - 24.7%) -- possible 6HKO after Leftovers recovery)
TankChomp: This is what I use and it's been working great. Again, it dislikes burns, but it gets the job done. Burned 0 Atk Stone Edge still does around 85% aka its ded after that and one round of Rocky Helmet/Rough Skin. Stealth Rock/Dragon Tail is another cool link and is the one I use. Dragon Tail does around 40% to Talon, so after Rocks and one round of Helmet/Skin damage its dead again (or its dead after using BB and AA getting the passive damage, losing health via recoil from BB, then getting killed by DTail)l
Ferrothorn: This loses to Flare Blitz and dislikes WoW, but it deals over 50% damage via 2 hits of Rocky Helmet/Iron Barbs and can Seed/Protect or Gyro Talon.
NOTE: One of these 3 (Ferro, Chomp, or a Rock-type) should be on most teams already, simply for the utility that Stealth Rock provides.
Mega Slowbro:
252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 252 HP / 252+ Def Mega Slowbro: 166-198 (42.1 - 50.2%) -- 0.4% chance to 2HKO
That is the absolute most Talonflame can do (and most usually run Acro, which is better imo). Acro does this:
252+ Atk Choice Band Talonflame Brave Bird (175 BP) vs. 252 HP / 252+ Def Mega Slowbro: 160-190 (40.6 - 48.2%) -- guaranteed 3HKO
What does MegaBro do back?
4 SpA Mega Slowbro Scald vs. 0 HP / 0 SpD Talonflame: 294-348 (98.9 - 117.1%) -- 87.5% chance to OHKO
Scald+Slack Off gets you back to around 50% if you switched in, otherwise, if you got a safe switch in, you're back at full pretty much. Or if you CM + Scald it's a guaranteed OHKO (duh lol).
Rotom-Wash:
252+ Atk Choice Band Talonflame Brave Bird (175 BP) vs. 248 HP / 216+ Def Rotom-W: 121-143 (39.9 - 47.1%) -- guaranteed 3HKO after Leftovers recovery
252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 248 HP / 216+ Def Rotom-W: 124-147 (40.9 - 48.5%) -- guaranteed 3HKO after Leftovers recovery
0 SpA Rotom-W Hydro Pump vs. 0 HP / 0 SpD Talonflame: 336-396 (113.1 - 133.3%) -- guaranteed OHKO
Nuff said really, the calcs show it all. Rotom-W can tank Talon's strongest hits and OHKO back. Btw this is just the generic OU Rotom-W, running more Def or SpA is definitely an option.
Heatran: The best counter to non-Ground Natural Gift Talonflame. Enjoys eating Wisps and Blitzes, and can tank Brave Birds all day.
252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 248 HP / 252+ Def Heatran: 121-144 (31.4 - 37.4%) -- guaranteed 4HKO after Leftovers recovery
Or you can run less Defense. 92 EVs avoids the 2HKO from Band BB/AA after rocks:
252+ Atk Choice Band Parental Bond Talonflame Brave Bird vs. 248 HP / 92 Def Heatran: 153-180 (39.7 - 46.7%) -- guaranteed 3HKO after Stealth Rock and Leftovers recovery
It OHKOs back with Ancient Power.
Now, you can say that a lot of these are worn down or KOed/neutered by the correct Natural Gift or WoW, but tbh, then they aren't defeated by the Band set I used, allowing them to tank more hits. This also allows other, less bulky but still decently bulky Pokemon to check Talon. All of them can beat Talon despite burns. Going back to what I said earlier about there being 4 main things that "centralize" Linked that every team must prepare for, Talonflame helps keep 2 of them in check. It is one stop to FakeTurn overwhelming the meta, as it can reliably revenge kill Infernape, Mienshao, and Ambipom, the 3 main FakeTurners. It also can revenge kill some of the main Scarfers, including Keldeo, Serperior, and Manaphy. I also don't think it makes Grass, Bug, and Fighting types unviable. I use Serperior and it is amazing, despite its huge Talon weakness. It can revenge kill many of the Pokemon in higher ranks such as Zard X, Keldeo, Quagsire, and Manaphy, and as long as you pack a Talon counter, it will perform exceptionally.
TL; DR: A whole bunch of stuff beats Talonflame, and if it doesn't run Band then more stuff beats it. Don't run BB+Roost since then it's still walled by everything it's walled by in OU .-. While it does force you to run a counter to it, there are Pokemon that do this in every meta. If we banned everything that you needed to check or counter, the meta would only consist of Caterpie and Feebas. Talonflame does NOT make Grass, Bug, and Fighting types unviable, as long as you use them correctly and pack a counter to Talonflame. Talonflame is a great mon in this meta, keeping two playstyles in check (FakeTurn and Scarf-setup), which would otherwise run rampant. I think if we were to ban Talon, the meta would basically turn into "whose Scarfer is faster" as no priority would be strong enough to care about really. Ditto does NOT keep these Scarfers in check as it can only speed tie them (it does keep the Megas in check though). So in my opinion don't ban Talonflame.