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Addresses 5000-5050 (WRAM) control what Pokemon you can find, along with what kind of battle. What i've noticed is that in Blue/Red modifying these addresses controls the Safari Zone battle style, where as it controls the hooked battle style in Yellow. I usually just type in the hex # of the Pokemon I want to catch in every byte, instead of leaving some strand of code alone (I apologize in advance if someone has already cleared this before.)