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>Yellow
Only for fags who didn't have Stadium or friends so they can have all three starters and feel special.
>Crystal
Objectively superior to Gold and Silver, very few downsides, some of which include not being able to get Lugia and Ho-Oh's Signature Moves and Mareep being completely absent.
>Emerald
Objectively superior to Ruby and Sapphire with more Double Battles, better Gym Leaders, added Secondary Effects to abilities, Quality of Life enhancements to breeding and some postgame substance even disregarding the Battle Frontier everyone creams themselves over.
>Platinum
The DEFINITIVE Sinnoh Experience. Expanded Pokedex, fixes some of the sluggishness from DP, addresses the lack of Fire Types to a mild extent, and postgame is a step up from DP's already serviceable one.
>USUM
Largely the same as SM but with mild graphical polish, minor story polish, a few extra Pokemon, Discount Battle Factory that'll be unusable once people abandon USUM for Gen 8, a Delta Episode-type Postgame with Rainbow Rocket and a Legendary Hunt like ORAS because pic related demands it.