Nintendo has not released a main Pokémon game for PC primarily due to business strategies that prioritize sales of their consoles1. Nintendo benefits more from keeping Pokémon exclusive to their consoles because this encourages consumers to buy Nintendo handheld devices1.
Other contributing factors:
Nintendo owns part of the copyright for Pokémon, preventing the game from being developed for other platforms without their permission1.
Nintendo's primary market is in Japan, where mobile gaming is favored over PC gaming due to the social structure1.
Nintendo has traditionally dominated the handheld gaming market, and releasing a main Pokémon game on PC would diminish the need to purchase their handheld consoles1.
Although main Pokémon games are not available on PC, there have been some exceptions:
An official digital version of the Pokémon Trading Card Game was available on PC but was discontinued in June 202312.
Pokémon TCG Online was replaced with Pokémon TCG Live, which received mixed reviews2.
A first-person online adventure game was released by Cyberworld International Corporation in 2000 as a promotion for the second Pokémon film. However, due to a contract dispute, the game was pulled after being available for only four weeks2.
A series of playable and collectable mini CD-Roms released by Mattel Interactive in 2000 featuring math puzzles and print programs2.