Brock in the Gym Leader of Pewter City, an intelligent man who mostly focuses his efforts on rock-type Pokémon. For trainers coming from Pallet Town he will usually be the first Gym Leader they face, and is the first challenge on their journey before scaling Mt. Moon.
The Museum is composed of two main areas: The one open to the public, and the one closed to the public. The public are able to enter the main museum where they can pay to gain entry and look at the exhibits, but there is also a separate building around the back where scientists and students work on research projects into the genetic origins of Pokémon. The research here is overseen by Professor Oak who will occasionally make journeys to the Museum to see how things are going.