Pokémon - April Fool's Day 2018

As their first ever April Fool's Joke, Pokémon Go changed all the in-game images of Pokémon on the Nearby and in your Pokémon storage to be icons from the main series Pokémon games

The Pokémon Duel April Fool's joke of the year introduced a special new figure via social media. This figure was "UFO" and had ridiculously strong powers

As a joke, the Kagawa prefecture of Japan announced a collaboration with Pokémon to add Slowpoke as their ambassador to match its Japanese name, Yadon with what the prefecture is known for, Udon Noodles. This ended up becoming a mainstay as Slowpoke became the first Pokémon Local Acts ambassador