Can i catch the legendary dogs on Pokemon Diamond?

I read somewhere that you can find the legendary dogs on Pokemon Diamond (and not through trading or the Park). Do I need to unlock or do something before they start appearing?|||Not that I know off.|||you need to unlock the pal park and have them on a old pokemon game like rudy

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|||u have to trade them from Pokemon Leafgreen or Pokemon Firered

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|||no you can't catch suicune, raikou, or entei in diamond you need to migrate them from previous games|||No, the only Pokemon that Roam are Cresselia and Mesprit. The Legendaries from the past games have to be transferred.|||No, you'll have to migrate or trade frm GTS|||NO