Instructions
Insert the Action Replay cartridge into your Nintendo DS, then place your "Pokemon Platinum" cartridge into the slot on the Action Replay.
Power on your Nintendo DS system.
Select the green asterisk icon on the lower screen of your Nintendo DS.
Choose "Add New Code" from the menu.
Name your code when prompted. Call it "Get Rayquaza" so that you will be able to easily remember the code's purpose.
Enter the following code:
94000130 fcff0000
b2101d40 00000000
e001ee24 00000010
0153012c 01de015c
ffff0122 00000000
1001ee34 00000000
2001f0f4 00000001
e000cf44 00000088
00000001 63e00000
19fb3c59 057c9f8f
798d0881 154804ed
df71552d c333ff47
c9b7eca6 500727cc
9589aa22 5fb531c4
54f606fe 259ecd5f
a2e01e03 dab8ec35
0655dc14 b769332b
debdc8b4 c265f4df
dadfb1af 2ff662a5
0c5f90d3 9457bf62
0c08022f d9757ad9
6d788e12 8a702c8a
f6959268 da33b05b
88f6fa10 a9b5db76
7605475f 237c91e5
d2000000 00000000
Press "Next" on the lower screen once you have finished entering the code.
Scroll through the list of available codes to the newly entered "Get Rayquaza" code, and select it by pressing "A."
Choose "Start" to resume playing "Pokemon Platinum," then "Continue" from the game's main menu.
Walk or fly to the nearest Pokemon Center and activate the PC next to the counter.
Choose "Move Pokemon" on the PC, and go to Box 1. Move whatever Pokemon is currently in slot 1 of Box 1 to another slot, ensuring that slot 1 is empty.
Exit the PC system. Press the left and right triggers simultaneously to activate the "Get Rayquaza" code.
Reopen the PC. Rayquaza should now be in slot 1 of Box 1.