:grog::grog:Woop woop found them! :grog::grog:
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If you need it, here is an event Arceus code for HeartGold and SoulSilver. Enter it into your Action Replay, and then hold down the L and R buttons when you enter a Pokemart. Talk to the man in green, and he will give you an event Arceus. You may use the code as many times as you want Arceus. The Arceus obtained through this code will activate the event, and I have tested it on my own SoulSilver game. Just put it at the first slot in your party and bring it to the Ruins of Alph like you're supposed to.
Toys'R'Us Arceus
94000130 FCFF0000
62111880 00000000
B2111880 00000000
E0009E4C 00000104
00000001 00000001
00000001 E9FC0000
80CC3D7B 9AF815B0
FBD75914 F45879D2
21244E0C 7405FF78
DA07DF53 C8E4AE17
56BF96AC 7676779C
E9F4F2FF 4E71CC2E
5C016360 F0098D53
53ED7155 0F2F1F73
28FB350E 556B032B
0D9642E6 4ACD38C7
C5B85DF2 6D8B57DB
F79ECB5E D0F22842
533488C3 E6467D22
1383A281 BA3458B7
5D118BF0 F7F08592
CEC2302C 427E331C
AC2141C6 1EE9D28A
B7A578BD 374C4A26
DEBC0CD8 92F95736
22317837 D4E459C1
82413E98 FF91B194
3CD5D027 02E7D2AB
1445107D D4934469
742B3167 A857A728
138B2BCE 26D8ABF6
975673D6 C1B333EB
D8372D49 062303D5
EEB0FDA5 0AB9A8B3
474E9945 00000000
00004000 00000000
D2000000 00000000
As a bonus, here is a code to repeat the Arceus event. After you have done the event the first time, input the code and hold down Start and Select when you have the event Arceus at the first slot in your party. Walk up to the Research Centre's door at the Ruins of Alph just like before, and the man will come out, triggering the event again. You can do this for as many time as you want Dialga, Palkia, and Giratina, as long as you have the event Arceus. I have also tested this code and it is how I obtained all three dragons.
Reactivate the Arceus Event
94000130 fff30000
b2111880 00000000
20000fea 00000001
20000ff8 00000000
20000ffa 00000000
200010e7 0000009e
2000112f 000000d3
d2000000 00000000
