Aerodactyl FOSSILS can be found in the ruins of alph, among other places. The fossil is called OLD AMBER to REVIVE the fossil, you have to beat the elite 4 and get to Pewter City in KANTO. Hope that helped!:)
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Im pretty sure you dont catch aerodactyl in heartgold but I think you can get him as a fossil, if you do, talk to the guy in the pewter city mueseum and he will turn it into aerodactyl for you.
If you're talking about an in-game trade, then no.
You can teach it that in the battle frontier in HeartGold and SoulSilver OR breed it Sky Attack.
In Pokémon HeartGold, Scary Face cannot be found as a TM however it can be found as a move that Charmander, Raticate, Rhyhorn, Machop, Flareon, Tauros, Aerodactyl, Spinarak, Totodile, Ursaring, Snubbull, Donphan, Larvitar, Poochyena, Carvanha, Masquerain, Huntail, Metang, Bagon, Kyogre, Groudon and Rayquaza can learn via level-up.
Aerodactyl does not evolve.