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I think depends on which series. Their official site lists all the series and each rarity seem to have different colors.
The machines are called Pokemon Ga-Ole and it seems they are available in Malaysia, Singapore, Hong Kong, Korea, and Taiwan. See their site https://world.pokemongaole.com/
@cryotosensei, you can probably bring your son to check it out since it's available in Singapore. But word of warning, these things could become a money sink if you do try to catch 'em all.