Pewter City is a small town at the northwest corner of Kanto, and the location of the very first Pokemon Gym. The moment you walk into town, your Rival will run in and give you 5 Potions.
Heal your team at the Pokemon Center to the northwest. A man behind the plant on the left side of the Pokemon Center’s lobby will sell Pewter Crunchies once a day for P500. This heals all status effects of a single Pokemon.
Directly after leaving the Pokemon Center walk around the back side of the building to find an X Defense. The Poke Mart is located a short distance to the north of the Pokemon Center. They will have the same items for now.
Additions After 1st Gym
X Sp. Atk
X Sp. Def
At the far north end of town is the Pewter City Museum of Science. You can go in and investigate some Pokemon history for P50, but it’s not a requirement.
The woman at the west side of the building’s outside will ask you to watch her Slowpoke once a day. In return, she will give you a Big Pearl.
That’s the only thing of importance in Pewter City, but you can always talk to the other characters to see how they feel about Pokemon! The next stop is the Pewter City Pokemon Gym, which is located between the Pokemon Center and the Pewter Museum of Science.