Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Regigigas can be defeated with three trainers, but if you cannot guarantee the top counters with maxed-out CP and the best moves, your best bet is to make sure you have four or more players.
Source: https://bleedingcool.com/games/regigigas-raid-guide-for-pokemon-go-players-may-2023/