This is like the wild shiny code and the encounter code mixed together. Action Replay Code for Pokemon Diamond

1. Press L+R at the inventory screen, then you'll get 493 Masterballs.

2. Set Masterballs' quantity to the Pokemon's number you want. (Example: Bulbasaur's Pokemon number is 1, if you want bulbasaur, discard until you have 1 Master ball)

3. If you want them to be shiny go to your trainer card and press R+A

4. Hold L and run in the grass, surf in the water, or go in a cave to encounter Pokemon.

Here is the code:

94000130 fdff0000

B21c4d28 00000000

B0000004 00000000

94000130 feff0000

00000890 01ed0001

D0000000 00000000

Da000000 00000892

Dc000000 00024620

C0000000 0000000b

D7000000 00000000

Dc000000 00000006

D2000000 00000000

02064ec8 47104a00

02064ecc 02000031

94000130 fcfe0200

02066db8 47084900

02066dbc 02000001

D2000000 00000000

94000130 fcfe0100

02066db8 95019000

02066dbc 90022000

D2000000 00000000

62000000 95019000

E2000000 0000004c

95019000 90022000

1c28b40d f0684907

1c01fd4d 2901bc0d

4902d101 49024708

00004708 02066dc1

02066d9f 00000000

95019000 69384a04

98046010 4b019a09

00004718 02064ed1

0200002c 00000000

D2000000 00000000

I didn't make this code. Creds to whoever did (I forgot who).