Starter Pokémon, or Starters, are the Pokémon a trainer chooses at the beginning of their Pokémon journey and the main protagonists of the Pokémon series of games. In each generation of Pokémon games, a set of Starter Pokémon are available for new trainers to choose from in sets of three; the types that make up these sets are Fire, Grass, and Water. Each starter Pokémon has three evolutionary forms. Pokémon Yellow , Pokémon Let's Go Pikachu and Pokémon Let's Go Eevee are currently the only exceptions to the above, with Pikachu as the only starter available to the player in Pokémon Yellow and Pokémon Let's Go Pikachu, and Eevee as the only starter available to the player in Pokémon Let's Go Eevee.
Bulbasaur and Rowlet are currently the only Starters to be dual-types in their basic forms, as aside from both of them being Grass-types, Bulbasaur's also a Poison-type while Rowlet's also a Flying-type.
However, Rowlet loses its Flying type and becomes a Ghost type.
Typhlosion's currently the only final evolution of a Fire-type starter to not be a dual-type.
In Unova, the Starters also gain signature attacks unique to them: Snivy gained Leaf Tornado, Oshawott gained Razor Shell and Tepig gained Heat Crash. Leaf Tornado and Razor Shell were given to other Pokémon in later generations.
Each one of their final evolutions have an immunity: Decidueye, a Ghost type, is immune to the Normal and Fighting types, Incineroar, a Dark type, is immune to the Psychic, and Primarina, a Fairy type, is immune to the Dragon type.
Starter Pokémon have unique special abilities: all Grass Starters possess the ability Overgrow, all Fire Starters possess the ability Blaze, and all Water Starters possess the ability Torrent.
The Elemental Monkeys are similar to the starters and are given in a similar manner.
Except for Pikachu and Eevee, all the Starters' final evolutions can learn the ultimate attacks by move tutor upon reaching maximum happiness. Grass-type starters can learn the ultimate Grass attack Frenzy Plant; Fire-type starters can learn the ultimate Fire attack Blast Burn; Water-type starters can learn the ultimate Water attack Hydro Cannon.
Most of the rival trainers will choose the starter that has the type advantage over the starter selected by the player. Bianca, Shauna, Hau and Hop all instead choose the starter that has the type disadvantage.
Sceptile gains Dragon-type as a secondary type on Mega Evolving, making it the only Mega Evolved starter to gain a new type (Charizard was already dual when the Mega X version replaces Flying with Dragon).
The player can later catch the first evolved forms of both the Kanto and Kalos starters in some Grass, Fire, and WaterFriend Safaris. This marks the first time any Pokemon related to starters have been available to catch in the wild.