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Bulbapedia exists because we as players need data on Pokemon to compete and train.
The Pokedex exists because the characters we play in the game need data on Pokemon to compete and train.
Perhaps there is a Pokemon-themed video game in the Pokemon universe, which has its own Pokemon encyclopedia.
Perhaps as we go down each level from reality to fiction in-game fiction, the encyclopedia become less informative, because the writers have less access to the true nature of Pokemon.
An in-game Pokemon-themed videogame must exist, since every Pokemon game contains a Nintendo console inside the protagonist's own bedroom. And Pokemon has been a Nintendo mainstay ever since the first Pokemon game was released in our world.
Really makes you think.
The fact that Bulbapedia is imperfect and contains often-nonsensical trivia sections suggests that we exist within a Pokemon simulation.
Perhaps on some higher plane, a perfect Pokemon encyclopedia exists...
One can only speculate.