In the games
The president is first met in Jubilife City, where he informs the player about the Pokétch promotional campaign. After obtaining three Coupons, he gives the player a Pokétch. After that, he can be visited at the Pokétch Company building. After completing certain tasks, or obtaining a Gym Badge, he will reward the player with a new Pokétch App.
In the anime
In the manga
In the Pokémon Adventures manga
Co. President in Pokémon Adventures
Pokétch Co. President first appears in Licking Lickitung. Diamond meets him after returning to Jubilife City; the president preaches to him about the Pokétch's various functions. He also dresses him up to be a clown for his campaign, and it is with his "teachings" that Diamond was able to catch the Lickilicky that was stealing valuables (including Pokétches) from people. After the conflict is resolved, he gets beaten up by the angry mobs who'd lost them, though.