>>40608502If Solosis is Bede's signature Pokemon, I can see Reuniclus having a Gigantamax or a Galarian form, as signature Pokemon are usually tied into something that is introduced in the same game. Usually rivals have a starter, but sometimes, like with Calem/Serena, they had Absol who could Mega Evolve in the final battle with them. Same thing applied to Wally, Hau (who used Pikachu family for Alolan Raichu), and Barry (who used Budew line because Roserade was announced if he didn't have a Grass-type).
If it's just random filler for his team, then it isn't as important, as past rivals also used dex filler Pokemon for their teams.