From Bulbapedia, the community-driven Pokémon encyclopedia.
Daisuki Special Features (Japanese: だいすきイチオシ特集) are special mini-sites by Pokémon Daisuki Club investigating topics from the Pokémon world and franchise. They vary in content, offering music videos, artwork, lore information and more, and often accompany promotional campaigns. The Pokémon Company International has localized some content introduced in special features, such as the Slowpoke Song and the Magikarp Song, in their own terms.
Before the Pokémon Daisuki Club redesign from 2014, similar features were often introduced in the official Pokémon website. The following list is partial.
Check Ash's Pokémon
Actually Scary? Pokémon
Enter! The Dragon-type!
Go Meet Pikachu! Outbreak-chu!
Pocket Monsters Special X & Y
Macho! Machamp Gym
Moyamoya Koffing: Pokémon World Travel
Freesia Infiolator in Hachijojima (3 Island)
Mezase! Cry Master! Cry 151
I love Magikarp
Pokémon Daisuki! Alola Tourist Guide
Magikarp Song "I love Magikarp" Dance Version
Pokémon Puppet Theater: Puppemon
Where is it, Magnemite? Here it is, Magnemite!
Pokémon Mystery File: Don't you know? The world of Pokémon
Strange!? Pokémon Form Dex
Daisuki Special Features (Japanese)