After running several experimental games with BluesEnergy00 on Showdown, I may have found a bug that concerns Ditto in GSC (Gen 2). On Smogon the item Metal Powder's description reads as follows:
If held by a Ditto, its Defense and Sp.Def are x1.5, even while Transformed.
When the move transform is used in battle it changes all of the stats (except the HP stat) and typing into those of what it is transforming into. Thus in order to test this fairly we pitted a pokemon against Ditto that naturally has the same base HP stat as it, in this case, Unown. Given that they both have a base HP stat of 48 it was ideal for this test. Logic would tell you that a Ditto carrying Metal Powder would simply transform into Unown (keep the same HP stat) and copy all of its stats but also have a 50% boost to both of these defenses even while transformed like the description says, but no. We found that instead of doing that in practice it seems that Ditto is simply not getting that promised defensive boost in its transformed state as can be seen here:
Assuming that is indeed an oversight, it is one that significantly effects Ditto viability in the competitive scene given that it doesn't enter the battle with the best stats to begin with (that is if anyone was tempted to use it at all).