This is a very short piece that I wanted to share before San Diego Regionals.
I played Lost Box Charizard in a 1K event yesterday and lost in top 4 to a Duraludon deck playing multiple Lost City, along with some other interesting techs. Although I was disappointed by the fact that I lost to someone who hard countered my deck seemingly on accident, I started thinking he may be onto something with this deck. Duraludon can play Crystal Caves and Hyper Potions to help with Lost Box, but it is better off simply playing two Lost City. From my experience playing against Alex (the local player piloting Duraludon), I can say that two two Cities were far harder to deal with than Crystal Caves would have been. However, the Lost Cities are also very good into the Regis match up. To further lock up the match up against Regis, Alex also had a Collapsed Stadium.
So, Alex had answered two of the meta’s most important match ups. However, that still leaves Lugia and Mew. Lugia is not a problem for Duraludon unless the Lugia player has certain techs. The average Lugia list has one Yveltal. If the Duraludon player simply knock out Yveltal, the game is over. Basically, Duraludon just needs to have a high enough consistency level to be able to do so, most games. Of course Lugia lists can play Path to the Peak, but most lists do not, and if they only play one copy, Duraludon should still be winning most of the time. As for Mew, Duraludon has no chance. Now that Mew is playing Paths, the match up is abysmal. But hey, The Don is still beating all the other top meta decks!
The one new issue Duraludon has is that Lost Box Rayquaza decks are going up in popularity and they may be a bad match up. I have not tested against it yet, but Rayquaza can one-shot Duraludon; theoretically, it could be a bad. However, there may be a strategy involving Lost City where the Rayquaza player simply has no Rayqaza left to use, after both of them are sent to the Lost Zone.
Arceus Duraludon list 
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Great article! I was thinking maybe next time if you could possibly put the PTCGO decklist link somewhere on the article or website so I can quickly copy and paste to play online!