Reserving snorlax before anyone else can
Snorlax @ Leftovers
Ability: Thick Fat
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
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Body Slam
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Darkest Lariat
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Rest
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Curse
So technically speaking, this isn’t a true counter, but in a 1v1 scenario, Snorlax beats Duraludon even if it switches into Draco Meteor, since Draco Meteor fails to 2hko this set, unless it’s a Draco Meteor -> Draco Meteor crit.
252 SpA Choice Specs Duraludon Draco Meteor vs. 252 HP / 252+ SpD Snorlax: 204-240 (38.9 - 45.8%) -- guaranteed 3HKO after Leftovers recovery
After that, it’s -2 and won’t do as much, so Snorlax’s free to Rest up and win the 1v1.
Realistically, in an actual battle, Snorlax is only a check. But in a 1v1 scenario, Snorlax is a counter. So I’ll leave it to
Oathkeepre to decide where to put Snorlax in.