Seeing a Shiny Pokemon is a 1 in 8192 odds or something along those lines, so seeing them in the anime is always a hype moment.

allowing trainers to catch and battle this powerful Ice-type Pokémon with a chance to obtain its shiny variant. Best counters include Mega Lucario, Shadow Metagross, and Reshiram. Future events ...

Pokemon GO is known for frequently introducing new monsters and shiny variants ... Shadow Pokemon through Shadow Raids, and Mega Pokemon through Mega Raids. One such Mega Pokemon that is known ...