Where to get oaks letter?

Pokemon Diamond:

94000130 fcff0000

B21c4d28 00000000

B0000004 00000000

0000aa3c edb88320

2000aa68 00000009

D2000000 00000000

Press L and R, then walk into a nearby Pokemart and talk to the man dressed in green.

Pokemon Pearl:

94000130 fcff0000

B21c4d28 00000000

B0000004 00000000

0000aa3c edb88320

2000aa68 00000009

D2000000 00000000

Press L and R, then walk into a nearby Pokemart and talk to the man dressed in green.

Pokemon Platinum:

94000130 FCFF0000

B2101D40 00000000

0000B5D4 00000009

D2000000 00000000

Press L and R, then walk into a nearby Pokemart and talk to the man dressed in green.