PerfectIVShinyStarterswRioluPikachuEeveeAbsol.zip is a release file of the Minecraft resource pack Perfect IV Shiny Starters with more starter options!, made for Minecraft 1.16.5. It was published on February 7, 2023 and is 1 MB in size. For the full description, screenshots and every other version, visit the Perfect IV Shiny Starters with more starter options! resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.