This is all the code for Action Replay for the Event Pokemon. Must have completed your game and have gotten the National Dex for these to work.
Arceus Event - Press L+R
94000130 FCFF0000
B21C4D28 00000000
B0000004 00000000
0000AA3C EDB88320
2000AA68 0000000A
D2000000 00000000
Manaphy Event - Press L+R
94000130 FCFF0000
B21C4D28 00000000
B0000004 00000000
0000AA3C EDB88320
2000AA68 00000007
D2000000 00000000
Darkrai Event - Press L+R
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
0000aa3c EDB88320
2000aa68 00000008
d2000000 00000000
Shaymin Event - Press L+R
94000130 FCFF0000
B21C4D28 00000000
b0000004 00000000
0000AA3C EDB88320
2000AA68 00000009
d2000000 00000000
Trainer: NIKO
Pokemon B/W Friend Code:
3783-4062-8709