Well really what i do ( though it takes a looong time ) is play the Coin Game in Celadon City and once u get a x1 x2 or x3 ( just one of them ) quit the game early and redo it. OR what you can do is, once the Coin Game starts, find the row(s) that have a 0 below the voltorb and click every square in that row, then quit and restart. :) Takes a long time to get anything, but it's worth it.
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Earn enough coins in the game corner and you can get an eevee as a prize for like 1100 coins or something
cheat, or play your heart out in games
You buy it at the goldenrod game corner for 2000 coins.
obtain on the pokewalker or cleadon game corner prize [15,000] coins
in soul silver