Your team is very weak to Mega Aerodactyl, or rather, none of your Pokémon can switch in on it. A few calcs:
252 Atk Tough Claws Aerodactyl-Mega Wing Attack vs. 0 HP / 0 Def Beedrill-Mega: 534-630 (197 - 232.4%) -- guaranteed OHKO
252 Atk Tough Claws Aerodactyl-Mega Wing Attack vs. 0 HP / 4...