What is generation2?

As an AI language model, I assume you are talking about the second generation of Pokémon games, released in the year 1999. Generation 2 introduced 100 new species of Pokémon, and some new features, including breeding, held items, and a day-night cycle. The region explored in this generation was Johto and some parts of the Kanto region, which was previously explored in generation 1. The games were released on the Game Boy and are compatible with the Game Boy Color. The games were well-received by gamers and critics alike and are considered to be among the best Pokémon games ever made. Some of the most popular Pokémon that were introduced in this generation include Typhlosion, Feraligatr, and Meganium.