The Pokémon franchise includes 718 revealed species of the title characters.Pokémon can be organized according to a number of different attributes. Pokémon can also be divided by the "generation" of games in which they were introduced and sorted by the other numbering systems introduced in those games. The first 151 Pokémon, introduced in Pokémon Red and Blue, have Kanto Pokédex numbers, which are the same as the first 151 National Pokédex numbers. 
Another 100 Pokémon appeared in Pokémon Gold and Silver to expand the list to 251 for the Johto regional Pokédex (to which 5 evolutions were added when the games were remade). The Hoenn regional Pokédex included 67 of these, alongside 135 new species that debuted in Pokémon Ruby and Sapphire, bringing the total to 386. Next, the fourth generation combined 81 (in Pokémon Diamond and Pearl) or 100 (in Pokémon Platinum) of the 107 new creatures from Pokémon Diamond and Pearl with 70 or 110, respectively, of the previous ones to form the regional Pokédex of Sinnoh. This was the first time not all of the newly introduced Pokémon were included in the games' regional Pokédex. Pokémon Black and White introduced 156 all-new creatures, which made up the entirety of those titles' Unova Pokédex. This leaves the grand total standing at 649. 
In the sequel Pokémon Black 2 and White 2, the Unova Pokédex was heavily modified, 145 species from previous entries were added and arranged into the original Unova Pokédex, bringing it to 301 species, though the grand total remained unchanged. Upon the release of Pokémon X and Y, 69 new Pokémon were been unveiled. The sixth generation introduces the fewest new Pokémon in a single generation, bringing the total number of Pokémon to 718.
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