The slot-machine parlour. Get the Coin Case from the man in the restaurant next door, buy coins at 1,000 Poke Dollars per 50 (or hunt the hidden coins on the floor) and trade them for Pokemon, TM15, TM23 and TM50. The Rocket Hideout entrance is behind the poster at the back.
Home To
Where something is met, and how. Characters are here as well as creatures: the guide records where Professor Oak stands and where each Gym Leader is fought.