Claydol puts the enemy at 10 hp, and Typhlosion's burn gives that last 10 damage.
This deck is very similiar to the expanded version I made earlier, but with a few modifications. (Since this is the same deck with modifications, I won't write up what the cards I explained earlier do. If you want, check out the description here: https://pokemoncard.io/deck/claydoll-one-shot-deck-92661).
The biggest change is that Claydoll has almost no tools that boosts it's hp, therefore, it actually knocks itself out. Hero's Cape is a Ace Spec card added to prevent this, and Roseanne's Backup shuffles it back in. Arven can then get it back.
Hypnotoxic laser was also lost, making OHKOing a bit less reliable, as you need abilities to finish off. Now, if abilitites are shut down by an ability or an ability gives immunity to effects, use Cancelling Cologne to shut it down.
Additionally, Fog crystal was also lost. It was replaced with nest ball.
Giacomo was added for a way to deal with Mist Energy, which shuts the whole deck down. Temple of Sinnoh does the same things as well.
Bibarel was added for draw power, as the original deck didn't have a draw engine. I made space by removing Florges. Training Court was replaced with superior energy retrivial.
Generally speaking, I don't think this deck is anywhere near as good as the expanded version, as it loses core cards, but it might still somewhat work.