Familiars like Pikachu, Eevee, Gengar and Gyarados have been engaged to promote the latest Pokémon Scarlet and Pokémon Violet video games.
Legendary Pokémon monsters Koraidon and Miraidon will, meanwhile, will embellish BTS trains on the Sukhumvit (Kheha-Khu Khot) and Silom Line (Bang Wa-National Stadium) lines.
The new games are scheduled to be released on the Nintendo Switch video game console on November 18.
Pokémon video games are developed by Game Freak and published by Nintendo and the Pokémon Company under the Pokémon media franchise.
The monsters, created by Satoshi Tajiri and Ken Sugimori, first showed up in 1996 in Game Boy handheld consoles in Japan as Pocket Monsters Red and Green, before going international as Pokémon Red and Blue.
The main series of role-playing video games (RPGs), referred to as the "core series" by their developers, have starred in each generation of Nintendo handhelds with different Pokémon, storylines and characters.
While the main series were developed by Game Freak, several other companies have developed spinoffs encompassing other genres like action role-playing, puzzles, fighting and digital pet games.
Pokémon is said to be the largest media franchise, with successful anime series, films and merchandise, with spinoff games like Pokémon Go having crossed 1 billion downloads worldwide. As of March 2022, the series had sold over 440 million units worldwide.