@hyper beam
There were reasons why Gen III+ wasn't compatible with Gen I and II, one of which is the contest stats, you know; the beauty, smart, cool, etc. Gen I and II, didn't have them, and don't say that contest stats are removed from the game once migrated to newer generations because Milotic can still evolve from Max Beauty in Gen 5.
Also shinies we have today are determined through 'Personality Values'. This didn't exist back in Gen I, so what happened in Gen II was that shinies were based on IVs.