You don't really need a glitch. After you beat the sixth gym, (check and see because i haven't played in over a year) talk to the sailor guy and he will say his son is having nightmares and he needs the feather to wake him up, so he takes you to full moon island and you see cresselia. It flies away and you see the feather. Press a on it and you will obtain it. Take it back to the kid and he will wake up.
if you meen darkrai, go to fullmoon island use walk through walls to go right (the way) don't stop until you see another fullmoon island darkrai will be in the passage.
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by using the Luna wing u get it from fullmoon island.
there is none. that is what i know from diamond. in pearl, its probably the same. - ho-ohawesomeness
on fullmoon island
Follow these steps 1 - Obtain the National Pokedex. 2 - Go to the Sailors house in Canalave City and talk to the sick little boy in his bed. He can not wake-up until he gets a special stone from Fullmoon Island. 3 - Talk to his Mum/Mom. 4 - Talk to the Sailor outside and he will take you to Fullmoon Island if you get the stone. 5 - Go to Fullmoon Island and get te stone. 6 - Give the stone to the boy. 7 - Give Chase to the Pokemon Cresselia, which is the Pokemon that sleeps there until you go there.
Go into the sailors house and talk to the boy in the bed. then talk to the sailor. i do not think there is a newmoon island in diamond and pearl because all i have ever heard of is iron island and fullmoon island so dont belive those liers. final answer. New Moon Island is real! If you have the walk through walls cheat for AR, you go east from Fullmoon Island! The darkrai event or a action replay you need the member ship pass by going to a Nintendo event