Shinies have a sparkle to them. I’m going back and exp farming while shiny hunting competitive natured Pokémon. I have a ton of extra shinies if anyone is interested, and not expecting preferred natures.
Off the top of my head. Pidgey, chansey, vaporeon, charizard, eggsecute (2), abra (2), dewgong, gengar, jynx.
Would consider shiny for shiny trades.