Pokémon Generations: regions, Pokédex and mechanics

The 9 generations at a glance

What is a Pokémon generation?

A generation groups the main games released on the same technical base and sharing the same set of novelties: new Pokémon, a new region, new battle or breeding mechanics. There are nine generations today, identified by the Roman numerals I to IX.

Each generation introduces a block of consecutive numbers in the National Pokédex. The first 151 Pokémon belong to generation I, the next ones to generation II, and so on. This continuous numbering is the backbone of the whole series: a Pokémon never changes its national number once it is assigned.

Regional forms, Mega Evolutions and other variants do not create new national numbers: they are tied to the original species. This is an important nuance when trying to guess a generation from a number. For the basics on what a Pokémon is, see the Pokémon guide.

Generation I: Kanto, the foundations

The first generation takes place in the Kanto region and covers Pokémon 001 to 151. The starters are Bulbasaur, Charmander and Squirtle. This is where it all begins: 15 types existed (the Psychic type was dominant, and the Dark and Steel types did not exist yet).

The core mechanics are set: catching with Poké Balls, turn-based battles, levelling up, evolutions, and the very first Pokédex. The idea of a Legendary Pokémon appears with the legendary birds and Mewtwo, along with the mythical Mew.

This generation serves as an absolute reference: many quizzes and players know Kanto by heart, which often makes it the starting point for learning Pokédex numbers.

Generation II: Johto, breeding and new types

The second generation introduces the Johto region (Pokémon 152 to 251) with the starters Chikorita, Cyndaquil and Totodile. It is a generation full of structural novelties.

• A day/night cycle thanks to an internal clock, affecting some encounters and evolutions.
• Breeding and Eggs at the Day Care, opening up a whole layer of gameplay around reproduction.
• Held items, letting a Pokémon carry an item into battle.
• Two new types: Dark and Steel, added partly to rebalance the dominance of the Psychic type.
• Shiny Pokémon, extremely rare colour variants.

Johto connects to Kanto at the end of the game, making it one of the most generous adventures in the series.

Generation III: Hoenn, Abilities and Natures

The third generation takes us to Hoenn (Pokémon 252 to 386), with Treecko, Torchic and Mudkip as starters. On new hardware, it brings systems that still define strategic depth today.

• Abilities: each species has one or more abilities providing passive effects in battle.
• Natures, which shape how a Pokémon's stats grow.
• Pokémon Contests, a parallel activity focused on beauty and style rather than battling.
• Double Battles become an important format.

Hoenn also introduces the legendary duo Groudon and Kyogre, plus Rayquaza, around a story centred on land and sea.

Generation IV: Sinnoh, the physical/special split

The fourth generation takes place in Sinnoh (Pokémon 387 to 493), with Turtwig, Chimchar and Piplup. Its most significant change is invisible at first glance but fundamental.

Before generation IV, whether a move was physical or special depended on its type. From then on, it is the move itself that determines whether it is physical or special. This overhaul, known as the physical/special split, transformed team building by making previously limited Pokémon viable.

Sinnoh also adds many evolutions and pre-evolutions of older Pokémon (for example evolutions of Kanto and Johto species), giving fresh value to creatures from earlier generations. The legendaries Dialga, Palkia and later Giratina anchor a story about time, space and dimensions.

Generation V: Unova, animated sprites and a fresh start

The fifth generation is set in Unova (Pokémon 494 to 649), with Snivy, Tepig and Oshawott. It stands out for a bold choice: the first part of the adventure features only brand-new species, giving a genuine sense of discovery.

Technically, this is the generation of animated sprites: for the first time, Pokémon are constantly moving in battle, bringing a lot of life to encounters. Unova also brings the largest batch of new Pokémon in the whole series and a direct sequel with a second pair of games.

This generation is often praised for its more ambitious story and pacing, marking a will to modernise the formula without abandoning the fundamentals.

Generation VI: Kalos, 3D and the Fairy type

The sixth generation arrives in Kalos (Pokémon 650 to 721), with Chespin, Fennekin and Froakie. It is an aesthetic and mechanical turning point.

• A shift to 3D: 3D models for Pokémon and battles, leaving sprites behind.
• Introduction of the Fairy type, the eighteenth and most recent type added to date, created in part to contain the power of the Dragon type.
• Mega Evolutions: a temporary in-battle transformation that boosts a Pokémon and sometimes changes its abilities or types.

Adding the Fairy type rebalanced the entire type chart. To understand how these relationships work, the Types guide details the strengths and weaknesses of every type.

Generation VII: Alola, regional forms and Z-Moves

The seventh generation explores Alola (Pokémon 722 to 809), an archipelago inspired by Hawaii, with Rowlet, Litten and Popplio. It shakes up the classic structure of the adventure.

• Regional forms: familiar Pokémon get a variant unique to the region, with a new look and often new types (the Alolan forms are the first of their kind).
• Z-Moves: extremely powerful attacks usable once per battle, triggered by a special item.
• The replacement of classic Gyms with island trials, which refreshes progression.

Regional forms are a major novelty because they enrich existing species without creating new national numbers, a key point to keep in mind for quizzes.

Generation VIII: Galar, Dynamax and Gigantamax

The eighth generation takes place in Galar (Pokémon 810 to 905), a region inspired by the United Kingdom, with Grookey, Scorbunny and Sobble. It is the first main generation on a hybrid home/handheld console.

Its flagship mechanic is Dynamax: for a few turns in certain places, a Pokémon becomes gigantic and its moves turn into powerful Max moves. Some species also gain access to Gigantamax, a giant form with a unique appearance and a signature move.

Galar also introduces cooperative Dynamax Raids and a large semi-open area, the Wild Area, foreshadowing the series' next step toward more freedom of exploration.

Generation IX: Paldea, Terastallization and open world

The ninth generation takes us to Paldea (Pokémon 906 and beyond), with Sprigatito, Fuecoco and Quaxly. It takes the full step into the open world: you explore the region freely, with no imposed order for the main objectives.

Its signature mechanic is Terastallization: in battle, a Pokémon becomes covered in crystals and takes on a Tera Type, which can match one of its types or be completely different. This opens up brand-new strategic options, since a Pokémon can, for instance, change its weaknesses to surprise the opponent.

Paldea also offers three interwoven storylines and a strong emphasis on cooperative online play, confirming the move toward more open and social adventures.

National Pokédex versus regional Pokédex

There are two ways to number Pokémon, and confusing them is a classic source of mistakes.

• The National Pokédex gives each species a unique, permanent number, in the order generations were discovered. Bulbasaur is always number 001.
• The regional Pokédex renumbers the Pokémon present in a given region, often starting with the local starters. So the same Pokémon can have a different regional number in each game.

When a quiz mentions a Pokédex number, it almost always means the national number. That is the one that lets you instantly link a Pokémon to its generation.

Why the Pokédex number helps in quizzes

The national number is a powerful clue because it encodes the generation. If you know the boundaries of each block (151, 251, 386, and so on), a number immediately tells you the era, region and style of the Pokémon you are looking for.

In the Pokémon Wordle, knowing that a Pokémon belongs to a recent generation points toward longer names or different sounds. In the Pokédex quiz, mastering the order of numbers saves precious time when identifying or ordering species.

The table below gives the exact ranges of each generation: it is an ideal cheat sheet to memorise gradually to climb the leaderboards.

Frequently asked questions