DizzyLochs , thanks for taking a look! I fixed that misspelling.
The EX Dragon "High Pressure System" card without the e-Reader logo was in the Blaziken Competitive Sideboard Kit as part of EX Battle Stadium. I was able to find a few listings for the card on ebay which is how I found the serial code -- should be 9UG-LG3-KJA for that version of that card.
I'm definitely interested in adding cards with Japanese backs as long as they have English text on the front -- does anyone know specifically how many TMB cards were printed like this, with both languages on the front? I added the Tropical Mega Battle cards to the spreadsheet a few weeks ago, but I didn't know about the bilingual ones. Those are probably still unaccounted for.
Amazing, thanks for the link. Very nice to be able to add an old stadium to the list for the first time in ages. I was happy to find one on ebay too as soon as I noticed it on your list, I bought one from overseas so hopefully can tick it off soon!
The Lucky Stadium and the Exeggutor (which were the only double language ones) were the 2 that were awarded/given to participants in the Tropical Mega Battle. There's only one printing of the Lucky Stadium. By the looks of it, the Exeggutor was reprinted shortly after in Trainer's Magazine Vol. 3. Then again more recently in the Japanese Expansion Pack 20th Anniversary and then in the English Evolutions set for 4 printings in total.
You will need to do a revision on majority of your pop series cards as the rares should be non-holo in the packs, but most of them are listed as holo. Similar issue to the above poster but it's not only pop series 3.