Twist Mountain bears a resemblance to a mine and has a complex network of caves. The mountain becomes filled with snow in winter, providing easier travel to different areas but also blocking off some tunnels; from inside, these tunnels are blocked off by a traffic cone. There is also a Vending Machine.
The Ice Rock is located in the lowest floor of the mountain, accessible from the central construction site. If an Eevee is leveled up on this floor, it will evolve into Glaceon. Located in the tunnel immediately before the Ice Rock is a Worker who will give the player a random Fossil of the Kanto, Hoenn, or Sinnoh regions once a day after receiving the National Pokédex. The type of Fossil can be changed by soft resetting, similar to a mass outbreak.
In Black 2 and White 2, a Worker near the entrance to Icirrus City will quiz the player, asking one question each day. If the player gets a question wrong, they must wait until the next day to try again. Answering all five questions correctly earns the player the Heavy Machinery ProMedal.
Which place is famous for an old rusty crane truck?
Twist Mountain first appeared in A Restoration Confrontation! Part 1. While being lost on their way through the mountain, Ash and his friends met an archeologist named Ferris and his friend Sierra. After uncovering a Cover Fossil, Ferris told the group how he had once been transported to the prehistoric time while exploring Twist Mountain as a child and befriended a Tirtouga in that time, although Sierra was convinced he had just been dreaming. Team Rocket then appeared and stole the Cover Fossil, revealing that their plan was to revive it, use the revived Tirtouga to lead them to the time portal at Twist Mountain, and use its life energy to maintain the portal long enough for them to steal the ancient Pokémon of the past for themselves. Using stolen information and resources, they successfully revived the Cover Fossil into a Tirtouga, which Ferris recognized as the same one he had met as a child.
In A Restoration Confrontation! Part 2, after Tirtouga had evolved into Carracosta, it traveled to the time portal, only for Team Rocket to attack it and use its life energy to expand the portal. However, before they could travel into the past, Ash, his friends, and more Carracosta from the past intervened, and Team Rocket was eventually forced to escape without any Pokémon. Before the time portal closed for good, Ferris returned his childhood friend Carracosta back to its own time through it and bid it farewell.
Twist Mountain Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.