Easy free stuff
An easy way to get free items on Pokemon ruby(don't know if it works on sapphire too)is to catch a zigzagzoon at the beginning of the game as soon as you get the chance and keep it in your party. If you walk around a lot and check back often then he\she will most likely have items on it. You cannot equip anything to them if you want this cheat to work, but you can get anything from pokeballs to super potions this way. And a side note. It doesn't matter if your zigzagzoon evolves if the cheat worked in the first place. It will keep picking stuff up at random.
If you need more help, we've got more Pokemon Ruby cheats and also check out all of the answers for this game
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