I'd like to introduce you all to Dachsbun, aka the ultimate counter to chi-yu x mane lmao
Dachsbun @ Life Orb
Ability: Well-Baked Body
Tera Type: Steel
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Tera Blast
- Play Rough
- Helping Hand
- Protect
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I know that going against the grain is your bread and butter, That Dude, but this Dachsbun has pretty crumby stats overall and it is toast after eating more than one strong special attack. In fact all it takes is one bad roll and Dashbund will faint from its own Life Orb recoil after taking one Shadow Ball from an itemless Flutter Mane under Breads of Ruin (62% chance*). Odds of living an item-boosted Shadow Ball in the same conditions are naan-existant.
Flutter Mane and Chi-Yu admittedly do have a ruff matchup into the Dachbund set you've cooked up, but this is only a half-baked solution if you aren’t also using Body Press to OHKO Chi-Yu after Dachbund’s Well-Baked Body gets a rise from a Heat Wave.
Dachsbun kneads Life Orb to do any meaningful damage against anything less frail than Flutter Mane, and even then it hits bulkier mons like a soft baguette. In other words I don't think Dachsbun is the breadwinner that is going to save the meta from Flutter Mane and so instead of loafing around with this UR mon, I think we are butter off accepting that a metagame with Flutter Mane is going to quickly become stale...like biting a into dinner bun and realizing it expired in 2013.

252 SpA Flutter Mane Shadow Ball vs. 4 HP / 0 SpD Ruin Dachsbun: 216-255 (84.3 - 99.6% ) -- 62.5% chance to OHKO after 10% Life Orb recoil from Dachbun's next attack