The slots CANNOT be cheated. Instead, play smart and make sure you have good odds. Each slot machine has different odds, so if you keep losing move on! Watch the reels closely and see which ones have the red 7 zipping by the most, and also watch for machines with slower reels. Slower reels mean higher chance of scoring. Alway bet 3 coins each time, and MASH A 3 times once you've hit down 3 times. Eventually you will win a 7-7-7 combo. If you are using leafgreen, use the slot machine to the left of the girl on the far left row of slots... I have been sitting there for an hour and I have over 3,000 coins. Remember, it takes patience. BTW, Porygon sucks, don't waste the 4,600 coins! Go for Dratini. (only 4,000)
unless you want to fill your pokedex, then get porygon, you can catch dratini in safari zone with a super rod.
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On Pokemon Pearl's title screen, if the Pokemon LeafGreen game is in the GBA slot, click on "Transfer From LeafGreen" and you can choose six Pokemon from LeafGreen to transfer to Pearl, but be careful-you can't trade them back.
All slot machines have the same chances.
In celadon city at the slot machines
after beating the game, insert the Pokemon leafgreen version for gameboy advanced in the GBA slot. You can then catch Pokemon from that version.
Insert leafgreen into GBA slot, then go to route 209 after you get the national pokedex.