Here's an AR code for Pokemon Diamond (U) that I didn't see in there:
Instant Breeding, and any pokes can breed:
with 2 pokemon of opposite gender in daycare, take 1 step while holding R,
the daycare guy should have their egg.
921ED3D0 00000E00
94000130 FEFF0000
121ED3D2 00004280
121ED3EE...