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September 19th, 2011 (01:54 AM). Edited September 19th, 2011 by miksy91.
A GB/C Rom Hacker since 2010
Join Date: Oct 2008
Location: A small country in the North
You should start by looking for the pointer that locates the text for pokemon that's evolving. I believe that leads you to the asm routine that is loaded after a wild pokemon or trainer battle ends (checks for pokemon that might evolve, if not --> load map again with some map loading process code).
Besides, the battle ram data might turn "empty" after the battle ends (happens with G/S/C at least) so in that case you should modify the asm code so that the game temporarily stores the whole battle ram elsewhere (and checks if one of the pokemon evolved and modifies its data while at it...).
What you're asking here sounds pretty much "impossible" to be and I wouldn't be the one to try it but with knowledge and a lot of work, it can be done.
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