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Since 255 seems to be the maximum for base stats, is it possible to make them 255 without the stats rolling back when gaining EV stats? (If Pokemon Gold uses either EV or IV to raise stats?)
DVs and EVs don't alter the base stats themselves at all, only the stats, so no problem with that (plus notice that Blissey already has 255 base HP). It is true that there is a stat cap at 999 but it can only be reached with stat boosting moves temporarily during battle and won't roll over (Thick Club Marowak's Attack being the famous exception, but that's only because of the boosting item).