Hey CTC, this is a core I made a while back and have had relative success with and found really fun to use.
Talonflame @ Choice Band
Ability: Gale Wings
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Flare Blitz
- Brave Bird
- U-turn
- Tailwind
Latias (F) @ Life Orb
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Psyshock / Defog
- Draco Meteor
- Hidden Power [Fire] / Defog
- Healing Wish
Medicham @ Medichamite
Ability: Pure Power
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- High Jump Kick
- Zen Headbutt
- Thunder Punch
- Ice Punch
The sets are pretty self explanatory for the most part. T-Punch on Medi is for Slowbro mainly, which is normally one of the few counters to it but is actually 2HKO'd. Plus Azu and Gyara, even the Bulky DD variant after Intimidate, get OHKO'd. Fake Out is effective but I'm not a fan of it.
The basis of the core is that the main defensive checks to Talonflame right now (Rotom-W, Heatran, Tyranitar) all get OHKO'd by HJK from Medi. Adamant Band Talon is a monster when it's checks are gone, and it also offers free switches for Medi with correct predictions using U-Turn, which is something Medi loves since it's frail and has shit defensive typing, so it rarely gets free switches.
Latias acts somewhat as a glue to the core. If I'm running Sand Offense (not sure if I should say "offense" since I opt to run Hippo over TTar since it's a solid answer to Thundy, which annoys the core) I don't use Defog on it since I'd have Exca to spin, but if I'm not then it's obviously a necessity for Talon. Healing Wish is great for this core because HJK misses can be game changing, plus Talon practically kills itself with it's STABs. Healing Wish makes me bring back either to full health, as well as give them a free switch, so they can do damage again.
Tailwind on Talon is probably my favorite part of the core since M-Medi is normally so easy to revenge because of its lack of resistances, poor bulk, and mainly its middling speed. But with Tailwind support Medi is at +2 speed for a few turns (obviously I only Tailwind when I'm sacking Talon) and can easily pick off weakened teams almost unopposed late game. It's also why I opt run T-Punch over Fake Out.
The issue I've had with core though is that Talon and Medi require so much support my teams end up more balanced and passive rather than geared towards offense since I have only three slots to account for a lot of threats, not that I mind but I'm not sure if it's just my style of teambuilding, so I was wondering if you could try to do something with it.
Not sure if the mons are too standard for you to want to build around but I'd appreciate it if you did. Thanks.