Even though ultra-rare shiny Pokemon were only properly introduced in Pokemon Gold and Silver, that doesn't mean that they don't exist in Red, Blue, and Yellow, and one mod will make sure you'll ...
If you plan on using Spotlight Hours to Shiny hunt, the best approach is to use an Incense and explore. Tap on every Pokemon you see, and if they aren’t Shiny, don’t bother catching them ...
Ditto’s chosen disguises changes from time to time, so you’ll want to make sure you know what the disguises are currently if you’re Ditto hunting — especially if you are after a shiny.