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ASM is added to the ROM file separately. For CFRU, you can add extra C code or scripts that are styled in the decomp scripting way.
People already added few Gen 9 Mons to DPE and abilities to CFRU. Just check the forks.
Emerald does not have enough space and we already have most of the...
Unbound was made with CFRU. So if you insert CFRU to your ROM, then you can do things such as increase the level cap. But changing the Gym Leaders is not something done by CFRU. You need to insert a new OW, and then attach a new script to it. Give a new team. If you want, a new gym map. Also...