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I want to catch Heracross in the original Gold.
I have been headbutting trees for ~2 hours and nothing. Spearow, Spearow, Aipom, Spearow...
It might be even more tedious than FEEBAS.
It's hard to tell whether you are headbutting bad or good tree. You have to do the statistics and check if the Aipom to Spearow ratio is 2/8 or 2/5 and try headbutting only the 2/5 ones.
So it basically means you have to headbutt each tree about 50 times to get that information.