There is a Mandela effect that Pikachu never had a black tail so

17 TV Mandela Effect Moments We Can't Believe Are Real

Pikachu Mandela Effect - 9GAG

Mandela effect

The Pikachu Mandela effect, explained - Did Pikachu have a black-tipped tail ?

Pikachu's Black Tail and the Mandela Effect - IMDb

The Mandela Effect: What, Why, and How? - - Take Action on Issues You Care About

Top 10 Anime Examples of the Mandela Effects

What ACTUALLY caused the Mandela Effect?

The Mandela Effect: your mind may not be playing tricks on you – Cat Talk