Icefall Cave
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did you get the ruby?
When you leave Pewter City after defeating Brock.
Defeat Team Rocket's Boss in the game corner he will leave the silph scope behind take it then leave.
Take it to Cinnabar Island go into the lab give the guy the fossil leave come back and then you will get an Aerodactyl
Once you have beaten the first Gym,in Pewter City, Professor Oaks Aid will give them to you as you leave towards Mt Moon.