Yes, this deck seems really interesting! I’ve heard people say that these cards are bad because Dark Box is rotating out, but, although these cards would be pretty good with Greninja GX, I think they have been made primarily for stand-alone decks. And I imagine that they will form a formidable combo! My only concerns are:
1. You have to decide how many of each Weezing you want. True, you can have four of each, but no matter what you will still be limited to four Koffing. Being able to have Koffing ready at all times is going to make or break this deck.
2. How would the existing Galarian Weezing fit into this strategy? Would it be worth including or not?