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You realize that the Shiny Odds were the same from Gen 2-5, right?
Only in B2/W2 could you manipulate it, with the Shiny Charm, obtained only when you beat the Dex.
So why on earth would you make this thread Gen 2/3 specifically? There's nothing in D/P/Pt/HG/SS/B/W that would make Shinies rarer or harder to obtain.
Only in Gen 6 was there a huge push from the developers to help Shiny Hunters. And even then, non-shiny hunting odds were still fairly high. Not as rare as Gens 1-5, but still rare enough that most players will still never find one.
So...
