I downloaded the only version available from your original post 11 days ago, so it should be the latest unless I royally misread something. Weirdly enough, after evolving my main heroes and trying this again to see if I'd get the same crash, everything works fine. I don't know what's changed other than that and being later in the story, but it's fine now? I've tried it twice and it works? Sorry! I guess something very specific there is going on and I don't know what else to say.
Unrelated, and this is a much more minor of an issue, the exclusive items for Sneasel and Sneaseler I think are supposed to be swapped name-wise? Climber's Bow has the move Dire Claw's effects, but the item Dire Claw absorbs damage from psychic type moves instead.
Also I'm like 99% sure there's something up with the spawn rate of the Climber's Bow. As mentioned above, it refused to show up once meanwhile seemingly every other mon's item was showing up very frequently. The moment I evolved Sneasel into Sneaseler I got the item for Sneaseler within a couple in-game days, but have still yet to see the Climber's Bow. Ironically I got both heroes' evolved items within the same in-game day as testing the Gold Ticket.
It's not a big deal, but I was a little disappointed. But again, I have no idea what would even cause that.