i only made a lefty hack from a request in gbatemp for this game but i didn't see the game in general .. can you check first if the code you looking is in here,

http://kodewerx.net/forum/viewtopic.php?f=19&t=4031

but in case you want to port codejunkies EU code, the code difference from EU to US is -20h

meaning if

Roget :
Infinite Health in EU
d3000000 021a8a92
f21a8a90 00000002
d2000000 00000000

Max Health in EU
121ab9ac 000003e7

-20h to convert it to US which will give
Infinite Health
d3000000 021a8a72
f21a8a70 00000002
d2000000 00000000

Max Health in US
121ab98c 000003e7