Go to Celadon City
Enter the Game Corner
Talk to the man standing near the counter and slots
He will give you the Coin Case if you have a Pokémon that knows Pay Day
If needed, teach Pay Day to a Pokémon first, then return to him
Go to Celadon City
Enter the Game Corner
Talk to the man standing near the counter and slots
He will give you the Coin Case if you have a Pokémon that knows Pay Day
If needed, teach Pay Day to a Pokémon first, then return to him