Mt. Pewter

Mountain Pewter is a place that stands besides Pewter City. It is introduced for the first time in during,  and 's visit to find Brock.

Part Red & Green
Mt. Pewter is revealed in. When can't find the Gym Leader Brock in Pewter Gym, he visits Mt. Pewter with  and  to find him. As soon as they step in, they are attacked by a group of Graveler and Golem. Brock then appears to save the group from the wild Pokémon. He reveals that mysterious things have been happening in the area and often wild Onix would be harmed. They investigate the problem and find out that a bunch of rocks have been blocking the stream to flow, therefore, the moss on the rocks would have stopped growing. Therefore, wild Graveler and Golem would have to feed Onix's moss on its body.