>>38813197>>38818248https://www.pokebattler.com/raids/defenders/ONIX/levels/RAID_LEVEL_3/attackers/levels/20/strategies/CINEMATIC_ATTACK_WHEN_POSSIBLE/DEFENSE_RANDOM_MC?sort=ESTIMATOR&weatherCondition=NO_WEATHER&dodgeStrategy=DODGE_REACTION_TIME&aggregation=AVERAGE&randomAssistants=-1This is the top 12 results for lv 20 battlers.
Apparently lv 20 Vapes can't do it but the point is, it's easy for anyone who's played for more than a week. At lv 25, you can do it with 3-4 Vapes. At lv 30, only 2. And so on. Minimal dust investment needed.
Aerodactyl seems harder though, sub-lv 30 teams are basically guaranteed failure. Probably because it doesn't have double type weaknesses like Onix.