>>47630687because Skyla, Sabrina, and Elesa aren’t as encountered as much as the literal main character or a rival. And unlike other MCs, Gloria got popular from character development (because “thick scottish accent and attitude” jokes). You could argue one for Cynthia since you meet her a few times in the games, but assuming Pokemon wasn’t nearly as popular then as it is now (cause GO and Switch), not as many people care about Cynthia.