From Bulbapedia, the community-driven Pokémon encyclopedia.
The Pokémon Exhibition is an annual festival held in Florando in the region of Johto. It is a gigantic outdoor Pokémon entertainment festival where Pokémon Trainers and Pokémon come from around the world to put on shows and perform. This venue is why Florando is famous. The festival, according to Brock and Misty, is advertised in Pokémon Trainer Monthly.
The Pokémon Exhibition was featured in Flower Power.