Although Archie was somewhat reckless, he knew that letting the ordinary members get too close to Groudon and Kyogre would simply send them to their deaths. He ordered them to stay behind and intercept Xia You as best they could, while he and Matt continued the pursuit with their Pokémon.
In fact, even Xia You knew that recklessly approaching two battling Super-Ancient Legendary Pokémon was extremely dangerous. He therefore recalled all his Pokémon except Gengar, Gardevoir, Dragonite, Raikou, and Suicune, charging into the enemy ranks with only his remaining top combatants.
Unlike him, Shelly and Courtney made no changes to their lineups.
That was mainly because the two of them had only sent two or three Pokémon into battle in the first place, so there was nothing to adjust.
Courtney fought alongside her three Mightyena. In this battle against Team Aqua, she had not sent out her signature Pokémon, Camerupt. Clearly, she knew that against so many Water-type Pokémon, Camerupt could do nothing but take a beating.
The three Mightyena formed a small unit of their own. Not only were they strong, but they also knew how to coordinate. Often, when one attacked, the other two defended it. Combining offense and defense, they displayed far greater strength than they could have fighting alone.
That was the nature of Mightyena. They loved acting in packs, maintained a strict hierarchy, faithfully obeyed their leader's commands, and relied on orderly teamwork to pursue and finish off their prey!
This also showed that it was not just Team Aqua-even Team Magma's officers favored these Pokémon and their way of fighting.
Shelly's situation was somewhat similar to Courtney's. Although she had no type disadvantages to worry about, fighting on land prevented her from displaying her full strength or sending out her ace. She could only