Question

Has a trainer in-game ever used a shiny?

Comments

Nice question *Upvotes question then realizes it's Pika's question* *Downvotes and flags* *Says Just kidding and upvotes again*

Answer 1

>In Trainer Tower in Pokémon FireRed and LeafGreen there are three Trainers which have Shiny Pokémon. In the Single Battle mode, the seventh Trainer has a Shiny Meowth, while in Double Battle mode, the first pair of Trainers have a Shiny Espeon. Finally, in the knockout mode, the fourth Trainer will send out a Shiny Seaking.

Source: Bulbapedia/ Shiny Pokemon