An easy way to beat the slots on Pokemon fire red?

Go to the line of slot machines 2nd from the left, the one with the fisherman, go 2 slots below the fisherman, the slot which is one above the last slot in the row. Bet 3, and press A super fast. i did this method, from 80 coins, i got to 1650+ coins in about 15 min, then i got bored.