Aerodactyl is a Rock and Flying-type Pokémon, which means it is weak against Water, Electric, Rock, Steel, and Ice-type moves. Here are some of the best counters against Aerodactyl:

• Water-type: Pokémon such as Blastoise, Swampert, and Primal Kyogre are strong against Aerodactyl.
• Electric-type: Pokémon such as Xurkitree, Shadow Raikou, and Electivire can deal significant damage to Aerodactyl.
• Rock-type: Pokémon such as Rampardos, Tyranitar, and Shadow Metagross can exploit Aerodactyls weakness to Rock-type moves.
• Steel-type: Pokémon such as Metagross and Melmetal can resist Aerodactyls attacks and deal super effective damage with their Steel-type moves.
• Ice-type: Pokémon such as Mamoswine and Articuno can also exploit Aerodactyls weakness to Ice-type moves.

Its important to note that Aerodactyl is resistant to Bug, Fire, Normal, Flying, and Poison-type moves. Therefore, its best to avoid using Pokémon that rely on these move types in your lineup. Additionally, its recommended to choose Pokémon with equal or higher CP than that of the Aerodactyl you are battling.