Hmm... So that card numbering is very interesting!
On last expansion, I picked up a small hobby: Trying to estimate the setlist order, based on official cards being revealed in english. At least for the most part, the cards in our sets come from 3 places:
- The main Japanese Set (In this case, SM7)
- Depending on the set, probably a miniset released before the one just mentioned (Here, it'd be "Champion Road" or SM6a)
- Eventual Japanese Promos that are included in our set (As Beast Ball in this case).
Anyway, with this 4 cards I can finally start... And already can see some interesting info from just that. To begin with, the placement of both Jirachi and Stakataka shows we're getting 4 Metal Pokémon cards in-between them. At least for the SM block of sets, Pokémon cards release ordered by Pokedex number, with GX potentially appearing after the "Baby" versions (based on Sun & Moon Base). Now, that'd imply we're getting 4 Metal Pokémon between Jirachi and Stakataka, but we only get 2 of those from both SM6a and SM7! Checking promos, the only two ones that could fill that gap through that logic are:
- Heatran (167/SM-P): A CoroCoro promo from the February 2018 issue. Different card from the UPR Metal Heatran.
- Solgaleo (067/SM-P): A winner card for "Pokémon Card Festa 2017". The one with the ability that gives itself no Weakness when it has any Metal Energy attached.
Assuming we do get that Solgaleo, I'd personally expect
Lunala (066/SM-P) to also be on the set, since it's the one other card from that event that never got a western release.
The second detail I found so far, knowing Electrode-GX's position, is that we may not get some of the cards in SM6a and SM7. Considering Voltorb as card #47 (for obvious reasons), there's 46 slots for all Grass, Fire and Water Pokémon in the set; however, those two sets contain 52 Pokémon Cards of said three types. So 6 wouldn't make the cut. My personal speculation would be for non Hoenn-native cards to be cut, and potentially moved to a future set (either Dragon Majesty, or our SM8 set). Another possibility is for some of the several repeating starters to be cut (like Torchic, which has 3 cards between the two JP sets!)
May post again if I see anything else, but that's what I gathered so far. Hopefully we get more cards soon, that help clarify this a bit better!