no you do not
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After you catch cresselia go back to Fullmoon island. You can then catch darkrai if you have action replay. Pick the cheat code that makes you walk or run anywhere. Then go right at Fullmoon island until you reach Newmoon island. Go in the cave and you see darkrai.
darkrai
well in Pokemon platinum you can just get the member card and get darkrai after getting darkrai you can get cresselia
iron island, (where you meet riley and he gives you a riolu egg,) Full moon island,(where you first see cresselia,) and New moon island (where you catch darkrai)
A Pokemon's catch rate can range from 3 (hardest to catch) to 255 (easiest to catch). Hardest to catch (catch rate = 3): - Uxie - Mesprit - Azelf - Heatran - Regigigas - Giratina - Cresselia - Manaphy - Darkrai - Arceus Easier to catch (catch rate = 30): - Dialga (& Palkia) Easiest Sinnoh legendary to catch (catch rate = 45): - Shaymin