Heracross and Aipom
You can catch heracross and aipom during the night time(aipom is sleeping) by these ways..
1. Teach your Pokemon HEADBUTT move
2. Go to Mt. Mortar - as you can see, there are three trees that contains apricorns (it is accessible by cut)
3. Just headbutt trees there until you can see heaacross and aipom. There are also sleeping sperows
More tricks, tips and cheats for this game are right here - Pokemon Crystal cheats
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