I'm afraid you cant get a Ditto in Pokemon Sapphire. You can only get ditto in Emerald. However you can also get ditto in Diamond and Pearl.
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you could just get a trade for ditto.
Another Abra of a different Gender or a Ditto.
Trade from Emerald/FireRed/LeafGreen. Ditto is not found in Sapphire go to fortree city when you find a wild absol teach it blizard go back to the grass and use a max repel the only Pokemon you will find is a ditto
If you have it, a male blaziken or a ditto.
give a Pokemon the masterball and put it in the daycare with a ditto then it will be cloned!!!!!!