ROM Hack I want to edit my battle vs Dialga in ORAS

[Xyphoseos]

Hello GBAtemp, I want to edit my battle vs Dialga in ORAS !

I want to edit this if is possible :

the dialga's shadow, the background and the level

how do it ?

Sorry for my bad english (I'm french)

 

[Kourin]

Documentation is lacking on ORAS.
Why do you want to do it anyway? It seems like a very minor change that just affects one of many battles.
How do you want to change it's shadow?