you can't get him again.
Egg a manaphy with a ditto
you can catch ditto but u need to get the national pokedex
Trophy Garden on select days
You can't catch it anywhere in the game. You need to breed a Manaphy with a Ditto in order to get it.
Ditto will hep you,just throw that game away and buy pokemon black.
Firstly you need the national Pokedex. then talk to the guy in the mansion (the owner) and sometimes he will say i have a ditto in my garden.
Ditto only appears at the Trophy Garden on certain days. You can catch other rare Pokemon there on other days. Hope this helped! =) (Even on the right day Ditto is rare.)
there is no trainer with a ditto but you can get one with the pokeradar next to canalave.NOTE:it will take a very long time and are not easy to catch.
no ditto is there
You can't catch ditto anywhere but the trophy garden. You could migrate it, though. That's what I did.
You can't catch a ditto in Pokemon Sapphire, but you can trade it from Pokemon Emerald/FireRed/LeafGreen.
you can catch a Ditto if you talk to Backlot every day for a long time. He will say that he saw a ditto there. Then, you can catch a ditto in the trophy garden.