Wall for superswablu (page 2)

Aerodactyl's main STAB attack is stone edge, which ground Pokemon easily switch into. Ice fang Aerodactyls can force ground Pokemon to switch out and stop them from using moves like stealth rock or stone edge.

but isn't Psyduck psychic type?

Here's a funny vid i found https://www.ign.com/wikis/pokemon-sun-pokemon-moon/Island_Scan_QR_Code_Pokemon_(Sun/Moon)#Monday

Welcome to the Database :)