Secrets - Pokemon Red, Blue and Yellow: While there aren't any hidden codes in the game, there are a couple of secrets and odd glitches. You can buy an Abra in Pokémon LeafGreen and Green with coins, but in Pokémon Red, Blue, and FireRed, it will cost coins. In Pokémon Yellow, it is. For Pokemon Yellow Version: Special Pikachu Edition on the Game Boy, a GameFAQs Answers question titled "What is the best way to get ALOT of Coins at the. Don't forget to buy an extra beverage for the border guards in order to get to Saffron City. Take a step downward and hit the start button the game before the Gambler Pokemon trainer sees you for a battle. After the grunt is defeated, the player sports heads 2 be able to push the button that opens the entrance to the Rocket Hideout. Do not attempt to catch it! Celadon City even lets you access the Ice Beam TM13which will make Vaporeon a lethal threat, even to Erika's Grass-types that normally have an advantage against Water-types.