The reason that shiny Pokemon in gen 2 had set IVs was because the IVs themselves determined if a Pokemon was shiny or not (
according to bulbapedia:
If a Pokémon's Speed, Defense, and Special IVs are 10, and its Attack IV is 2, 3, 6, 7, 10, 11, 14 or 15, it will be shiny)- so if a Pokemon had those IVs, they would be shiny. This also allowed for one to breed for shiny Pokemon as the IVs passed down could match up again if the parents were shiny.
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All I know is that Generation II is when they introduced the Scale 31 IV system for each stat; I may even be wrong about that.
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Not so - gen 1 and 2 both had values 0-15 - gen 3 was the one to change the IV system (which is why you can't trade from 2nd gen to third gen - the system was different). That also included making the shiny chance no longer dependent on the IVs of the Pokemon.
Anyways... I don't really see how this would actually make anything nostalgic. =/ Not many people at all knew the finer points of what made a shiny Pokemon shiny - I certainly didn't, and all that people at school and so forth knew was 'shiny Pokemon = rare'. On the face of it it'd only make a difference to hardcore breeders, and even then the system would be different (as they wouldn't change the IV system just for HGSS - they'd make the shiny system based on the IVs the way they are now and even then that could be problematic compatibility-wise with D/P/Pt). Furthermore there is no reason to go back to the GSC system as well - they already have a set IV system and that one was/is way too different to now. Hence I don't see much discussion tbh that'd be new from what has alrady been said, so I shall close this.