Yeah, GameFreak figured out the casino stuff wasn’t a good idea in gen 4 (HeartGold/SoulSilver) and replaced slots with Voltorb Flip outside of Japan, and otherwise closed the game corner in subsequent titles. In Pokémon: Let’s Go (Gen7) the player receives Porygon from a random person instead of needing to grind coins in the casino. Would be interesting to see if they could/would hack in that change.
If anyone has the git repo downloaded, they have a copy of it (from when they last pulled)