The games were fine, more luck based than fishing was but that is literally the premise of it. I thought it took a bit too long to get Roulette or Slots results, but that may be my device.
Does feel like the only sensible way to get the high coin counts was the Cards though. The fact it doubles bets means it snowballs pretty quick, and even without save scumming doing it that way seems the most realistic.
Also, at the end of Roulettes there was a missing <span> thing. Separately I found a typo during Porygon's anal scene where her beak is referred to as a peak, but that's almost fitting for such an angular mon.
The roulette and slots are basically running on 3 phases and they'll move to the next one at random, I tried to set it so it won't take TOO long but sometimes the RNG gets silly and they end up going for ages.
I can probably try boosting the payouts for slots and roulette to make them worth playing.
And I'll get those errors fixed up, thanks for the report!
