There are many Items and Rocket Gang members in here. You need to warp around quite often. If you get the Card Key, you can move more freely and get to the boss. After beating Gary (yes, he is here), a man will give you Lapras. At the 11th floor, fight Giovanni (again) and if you win, you will get the Master Ball. It has a 100% chance of catching. Now you have a choice at this point... either waste it on some arbitrary Pokémon, or use it on crucial one-time Pokémon including: The Legendary Birds, Snorlax, and Mewtwo. The Birds are Lv.50 each and are very powerful in their own element, the Snorlax are Lv. 30 and are quite good, while Mewtwo is "THE" perfect Pokémon and starts at Lv. 70.
