An unreliable one, but still one at that: The 7's on the slots have a black background which makes them very visible on the slot machine's reels while spinning. One could cheat the system very easily using this method.
Also, if you're using an emulator, you can use save slots to win at the slots at the far right in Goldenrod. Just save before you choose a random thing, then look what the correct one was, load your saved file and choose the correct one. It won't be changed. The whole thing about slots is based on luck. If you manage to get all 7's, then congrats (Honestly, I never have before xD. However, I have seen people do it. Good luck!!
(If you playing on an emulator, There are probably GameShark codes to get all 7's. I don't use gameshark codes, however you can still look.)
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All slot machines have the same chances.
In celadon city at the slot machines
First go to game corner and start the game and play
Put the pokemon you want in the first slot in your party. And there you go! Your pokemon is now running alongside you. Have fun with your pokemon, then!
In Slot Machines