To be able to obtain Shadow Serperior, the Regal Pokemon, at Pokemon GO Fashion Week: Taken Over 2025, trainers can evolve Shadow Snivy into Shadow Servine using 25 Snivy Candy. Then, they can evolve ...

If not, you should consider catching and evolving Totodile. As a Feraligatr, it's not the fastest Pokemon out there, but its base Attack and Defense make it a good battler if it's trained properly.