G/S/C- How to get Aerodactyl
To get Aerodactyl without cheating, go to the route east of Fuscia City, and at the corner of the route, there should be an elevated area where ledges primarily surround a large grass patch with Chansey in it. There should be a girl standing in there... You can trade your Chansey for her Aerodactyl.
More tricks, tips and cheats for this game are right here - Pokemon Silver cheats
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