There are 898 unique Pokémon species across all generations from the official Pokémon video game franchise. This count starts from the first generation with Bulbasaur (#001) and ends with Calyrex (#898) in Generation VIII.

The precise count of Pokémon can change as new games are released and new Pokémon are added by the developers at Game Freak and The Pokémon Company. This number does not include different forms of the same Pokémon, such as regional forms, alternate forms, or Mega Evolutions. 

The number of Pokémon is typically well-documented across a variety of sources. For the most accurate and up-to-date count, you should refer to the latest official Pokémon materials or reputable gaming news outlets.

Regarding the credibility of Wikipedia as a source, while it's true that it's usually not accepted as a primary or reliable source in academia due to its openly editable nature, it can still provide a good starting point for research and often provides references to primary sources that you can check directly for more rigorous verification.
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