Mt. Silver was off-limits to all but the most skilled of Trainers. After someone receives all sixteen badges of Johto and Kanto, Professor Oak will give the player permission to travel here.

The route to the area was rough, though no HMs are explicitly required to reach the Pokémon Center just outside the entrance. Inside, however, the cave is dark, requiring Flash to see in the first room. Many high-level Pokémon reside in the cave, as well as rare Pokémon not found elsewhere in the Johto region, like Larvitar and Misdreavus.

The cave had only one entrance, unlike all other caves found in Pokémon Gold, Silver, and Crystal, but went deep into the mountain. In the cave's final room, any traveler who deserved to would have the chance encounter Ash, who challenged all the players who approached him to what he believes is the highest-leveled Trainer battle in the Pokémon canon.

Ash resided deep within the cave. Misty, May, Dawn, Iris and Serena were invited by him to check out his cave. Ash had paid contractors to turn it into a mancave using money won from his battles, he was also able to buy a Nintendo Switch, a 70-inch TV and some Switch games. It all looked like his personal retreat, the ladies wanted to also have a place like his. They hatched a plan on how they could be able to reside there as they wished, with or without Ash.