Im afraid you cant without cheats or hacks :( no legendary Pokemon is breedable.
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no because no real legendary can breed. cresselia can its female
sadly, no. legendaries cannot breed unless you use a cheat. :)
No, actually I tried that and it didn't work even though Heatran has a gender. You can't breed any legendary poke'mon except for Manaphy which gives you a Phione. you can use action replay Ya I tried you cant breed heatran with ditto, or at least not a male heatran. No,even if it has gender it can't breed.Well,Heatran and Cresselia are legendaries alright,but not Rotom.Rotom CAN breed,if you have a Ditto. Here is proof they are legendaries/not: Rotom:http://bulbapedia.bulbagarden.net/wiki/Rotom_(Pok%C3%A9mon) Cresselia:http://bulbapedia.bulbagarden.net/wiki/Cresselia Heatran:http://bulbapedia.bulbagarden.net/wiki/Heatran.Latios and Latias can't breed too.
If Cresselia disappeared off of your map completely, then you have already caught Cresselia, or there is a glitch in your game where Cresselia has just disappeared off of your map. Further details would be needed for a more in-depth assessment as to why this has happened if neither of the two reasons stated are why Cresselia isn't on your map.
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