Viridian City is a large city located in western Kanto. In Generations I and III, Team Rocket's boss Giovanni serves as Gym Leader, although the Gym is locked until the player has gained the first seven Gym Badges.
The City's gym is also the main base of the Team Rocket leader, Giovanni. It has floor tiles that move you and many trainers. Giovanni specialises in Ground Pokémon, and when you defeat him you are free to leave and to go to the Elite Four. Blue takes over as Gym Leader in Generation II, with no particular type of Pokémon.
The Pokémon Academy is a building, located in the center of the city in Generation III only, that is dedicated to teaching the basics of Pokémon to inexperienced trainers. Many trainers that pass through Viridian fall under this category, making the city an ideal location. In Generation II this school was rebuilt and tuned into the Trainer House.
A unique attraction in Generation II-era Viridian is the Trainer House, a location where trainers from far and wide can battle one trainer, once per day. Trainers will face the last trainer they used Mystery Gift with, along with that trainer's party. If they have yet to unlock or use Mystery Gift, the opposing trainer will have a trio of Level 50 Pokémon, namely Meganium, Typhlosion and Feraligatr. In HG/SS, the player needs to connect with another players Pokewalker not thorugh Mystery Gift to unlock them in the Trainer House.
Exit onto Route 2
On the edge of town, toward the Green Forest, you meet an old coffee addict who on your first visit you unable to leave the village along this route until you've delivered your package to Professor Oak. Also, in your second visit will show you how to capture a Pokémon.
The Pokémon Center in Viridian City is the first Pokémon Center you can access in any of the Kanto Games: Pokémon Red, Pokémon Blue, Pokémon Green, Pokémon Yellow, Pokémon Fire Red, and Pokémon Leaf Green.