Sorry it’s been so long. Let’s see what I can remember.
As is probably obvious by now, Mahemoth is one of the Tenno Region’s two fossil Pokémon. Instead of going for ancient invertebrates and/or dinosaurs like we normally see, I decided to go with something slightly different and make a fossil from the Ice Age. Frostover Island itself is the actual location in-game where you can obtain your choice of fossil. Speaking of Frostover Island, one minor liberty taken by this episode is the island. In Luna, Terra, and Sol, the only way to get to Frostover Island is by surfing, and Surf is not available until later in the game, so you have to fly back to Versal once you get it. Frostover Island is meant to be a location for the trainer to explore and to serve as a training location. It has no real reason to exist as far as the story is concerned, but between the training options there, the Ice-Types that can only be found there, and the fossil given as a reward for making it to the end of the glacial tunnels, it’s not a pointless location.