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The Pokémon franchise begins with its first two titles released in North America.
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Pokémon Yellow version is released as a "special Pikahu edition," allowing players to start with a Pikachu rather than the original starter Pokémon choices.
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Pokémon enters its second generation of games with Gold and Silver versions, containing many new Pokémon and a new story line.
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Pokémon Crystal version is an update to its predecessors in the second generation, Gold and Silver.
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Pokémon Ruby and Sapphire versions bring the franchise into its third generation of new Pokémon and worlds to explore.
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Pokémon changed majorly between the second and third generations, making their games no longer compatible. Therefore, they remade generation one games so that they could be captured by newer trainers.
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Pokémon Emerald can be considered the third in the Ruby and Sapphire duo, making it a trio, as its story happens in the same world but, as with the other two, there are many plot differences.
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Pokémon's fourth generation begins with the release of the games Pokémon Diamond and Pokémon Pearl.
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Pokémon Platinum, like Emerald to Ruby and Sapphire, can be considered the third in what it makes the Diamond and Pearl trio.
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Pokémon HeartGold and SoulSilver versions follow suit with FireRed and LeafGreen, in that they are remakes of the previous games, Pokémon Gold and Silver.
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Pokémon enters its fifth generation with the release of its Black and White versions.
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In generation five Pokémon has released its first outright sequels, Black 2 and White 2.
