I think depends on which series. Their official site lists all the [series](https://world.pokemongaole.com/sg/disksgame/part01.html) 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.

Are the legendary ones the gold ones?
I seem to remember other colors, too. 
Maybe a red one?


Satosora

My brother in law told me each machine spawns a rare / legendary pokemon each day and once that legendary pokemon gets captured, the machine won't spawn another one until the next day.

gnilma

alter_native

Parent’s Corner: my boy loves Pokemon, so do I

cryotosensei

Right, these cards. 
I know in the claw machines, they had special gold cards. 
If you could manage to grab them....big if. 