A) Go to Japan for a Nintend Pokemon Convention and download the Member's Card

B)Use Action Replay's "Run/Walk Through Anything" cheat. Go to Canalave City and talk to
the sailor and have him take you to Fullmoon Island(where Cresselia is) and run through
the trees to the right and keep on going east until you hear wierd music and the screen
tells you you're at NewMoon Island. Go into the woods to the north, and Examine the
Darkrai. Get ready for a battle against a Lv. 40 Darkrai. Good Luck!