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there's other ways to get it, but if you get 4000 coins in the casino you can get it as a prize
You find it in the casino for 4000$ or in the abandoned ship
Mauville Casino-4000 coins or Abandoned Ship Storage Room
You will can get Ice beam at the Casino. It cost 4000 coins. You can also get it aboard the Abandoned Ship.
Iron tail is in Meteor falls and you get Thunderbolt from the casino/game corner for 4000 coins.