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It's pretty easy to change the starters by editing the scripts where they're given (this is essentially just what A-Starter does). In vanilla FireRed, they're at:
0x169BAB (Bulbasaur)
0x169D78 (Squirtle)
0x169DAE (Charmander)
or you can get to them by using A-map and opening the scripts for each of the Pokeballs on the table in the lab. In the (fifth) line:
Alternatively, just use a hex editor and change the bits at:
0x16BB5 (Bulbasaur)
0x16D82 (Squirtle)
0x16DB8 (Charmander)
to the hex code for whatever Pokemon you want.
Of course, this won't change the text that occurs at those points or affect what Pokemon your rival gets, but it will change the starter you receive as well as the preview picture displayed while you're choosing.