I guess u mess up some pointer. Try to change some pointer or define value in hook_and _misc.asm and define.asm because you had repoint them somewhere in pokedex expansion.
An easier solution, apply rombase first, then pokedex expansion.
AFAIK it never crash in my game since I apply the rombase first.
An easier solution, apply rombase first, then pokedex expansion.
AFAIK it never crash in my game since I apply the rombase first.