The first person to conceive the idea of a Pokémon wiki was Meowth346 of Pokémon Forever. Eventually, Bulbapedia itself was created in December 2004, and opened to the public the following February. In April 2005, nYoo suggested a German-language version. Later in the year, in August, the idea that would eventually spawn PokéWiki came to be.
Due to their both being open content wiki Pokémon encyclopedias, PokéWiki and Bulbapedia soon allied to form Encyclopædiæ Pokémonis, hoping that soon more would join the group. Eventually, the Japanese-language ポケモンWiki answered the call in June 2006, having been created in April of that year.
On 6 April 2007, the Polish-language Wikinezka joined the group. The French-language Poképédia joined in September 2007, and the Portuguese-language LANDpedia joined in December, 2007. The Spanish-language Pokéteca joined in August, 2009, while the Italian-language Pokémon Central Wiki joined the group in August 2010. The Chinese-language 52Poké Wiki joined in March 2013. The Spanish-language WikiDex joined in May 2018.
Encyclopædiæ Pokémonis is Latin for Encyclopedias of Pokémon. This translation takes the idea that 'Pokémon' is both the singular and plural one step further, by using the singular 'Pokémonis' rather than the plural 'Pokémonum'.
The logo of Encyclopædiæ Pokémonis is a Poké Ball image superimposed over a polar azimuthal equidistant projection of the planet Earth, reminiscent of the Flag of the United Nations. The color of the Poké Ball, as well as the color of the underlying Earth, differs among the individual members of Encyclopaediae Pokémonis: Bulbapedia's is green, PokéWiki's is teal, Pokémon Wiki's is blue, Wikinezka's is red, Poképédia's is yellow, Pokémon Central's is indigo, 52Poké Wiki's is vermilion, LANDpedia's was orange, and Pokéteca's was brown.