Pokémon Quartz

Pokémon Quartz is a ROM hack of Pokémon Ruby made by Baro. It is set in the Corna region.

Main game
The story begins with the player riding in a moving van with Professor Baro. The player and their mother have just moved in to Breeze Town of the Corna region. Coincidentially, the player's rival and their mother have also moved in to the next-door house around the same time. Upon meeting the rival, they immediately develops a crush on the player while doing a poor job at hiding it.

The player later encounters Professor Baro at "BREEZE WY," where he is being chased by a wild Sever. Professor Baro asks the player to take a Poké Ball out of his bag, where the player may choose their starter Pokémon. After choosing, the player battles and defeats the Sever. After rescuing Baro, he lets the player keep the chosen Pokémon as thanks for saving him. He asks the player to meet up with their rival at "ROCK CN." After the player battles and defeats the rival at "ROCK CN," they return to Baro's lab, where they each receive a Pokédex and some Poké Balls. From there, the player may travel to more cities and towns, battle and defeat the Gym Leaders of the Corna region, and challenge the Pokémon League. Along the way, they will encounter Band Ambar, an electric-based evil organization led by Amber whose goal is to "inflate the sun" to make Electric-type Pokémon more powerful.

Gyms
There are eight Pokémon Gyms in Corna (including a bonus gym after beating the league), each with their own type affiliation. The Gym Leaders are Betti (Bug), Fausto (Ghost), Max (Ground), Nieves (Ice), Benito (Poison), Lorenzo (Grass), Danny (Dragon), Nadia (Dark) and the bonus gym after beating the league; Arturo (Water).

Elite Four
The Elite Trainers are Roco (Rock), Perica (Psychic), Colombo (Flying), and Martha (Steel); the Champion is Annie, who primarily uses Dragon-type Pokémon, but has other typings as well.

Pokémon
Pokémon Quartz is known for introducing many new Pokémon that replace the already existing ones.

Trivia

 * Pokémon Marble is the sequel to Pokémon Quartz, though it was never finished and is only available as a beta release.