Aromatisse @ Lum Berry
Ability: Healer
EVs: 252 HP / 252 Def / 4 SpA
Relaxed Nature
IVs: 0 Atk / 0 Spe
- Odor Sleuth
- Dazzling Gleam
- Moonblast
- Trick Room
 
Aromatisse's key advantage over Dusclops, the other TR setter with Foresight/Odor Sleuth, is that it has an actually decently strong completely unresisted spread otion in Dazzling Gleam. This gives the Aromatisse/Aron frontrow significantly better 4-0 capability, since it's frequently possible to have Aromatisse kill something on the side over 3-5 Gleams without having to land an Endeavor on it.
 
(Notably, Evelyn's Latios1 at 50 can be handled this way, and can easily be stalled out of Luster Purge by sacking the backups, which renders it utterly incapable of touching Aromatisse, saving you from Lax Incense hax.)
 
Doubling up on STAB with Moonblast looks weird, but that slot is always going to be the least-selected move, and you want *something* stronger than Dazzling Gleam to pick up the kill on stuff like Sitrus Mold Breaker Rampardos4. We go megarelaxed because it gives us ~90% to live Tyrantrum4's Head Smash and get off Trick Room anyway.
 
Aroma Veil is normally also a selling point for Aromatisse, but for the purpose of going to 50 with an Aron team, it's shockingly irrelevant because stuff rarely actually *tries* to Taunt Aromatisse, so the tiny chance that Healer undoes a side-effect burn/para on Aron is probably more relevant.

Aron @ Berry Juice
Ability: Sturdy
Level: 1
Mild Nature
- Toxic
- Endeavor
- Sandstorm
- Protect
 
This is a level 1 Aron, whose presence entices most stuff that isn't mono-Poison-attacking to try to kill it instead of doing anything funny.
It's not perfectly reliable at this, but it's pretty rare and the team plays fast enough that you can probably retry when you're just aiming for 50.
 
Sandstorm is definitely the least-clicked move.

Talonflame @ Sharp Beak
Ability: Gale Wings
EVs: 236 HP / 252 Atk / 20 SpD
Adamant Nature
- Brave Bird
- Flare Blitz
- Tailwind
- Protect
 
This is a completely normal doubles Talonflame; Gale Wings Brave Birb lets it operate without caring too much about whether TR has been set up or not.
Feel free to run like, Life Orb and 252/252/4, because those are micro-optimizations meant for a different team that probably never come up anyway.
 
You can replace this slot in battle 50, since Aromatisse + Aron usually handles that fight just fine. Heck, you can replace this with anything vaguely competent, since the backups only come out in two situations: either something's wrong and either TR didn't go up (read: Rock Slide flinch) or Aron can't stay out (usually hail exactly), or you need cleanup in a 3v1 situation.
Gale Wings Talonflame is a deluxe priority spammer in gen 6 for the latter case, but hardly critical, though the option of a semi-fast Flare Blitz is nice since you can run out TR if you're facing a bunch of steels that Aromatisse can't Gleam down.
 
You can run Sunny Day > Tailwind, I guess, you never click Tailwind on this team.

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 228 HP / 4 Atk / 4 Def / 252 SpD / 20 Spe
Careful Nature
- Toxic
- Protect
- Bulldoze
- Substitute
 
This is just my third-favorite singles Gliscor set. It handles blind 1v1s pretty well, I guess. This isn't actually even a good choice for the slot, but I've run singles Aegislash + singles Gliscor as the backups on this team to cut corners on actually training extra mons so I know it's Fine lol
 
You can replace this slot in battle 50 too.