Basically, I'm asking who's faster. Assuming no speed drops or anything happened, who would be faster. An example is your opponent's scarfed Ditto being sent out against your scarfed Shadow Calyrex. Would Ditto out speed Calyrex, Calyrex out speed Ditto, or would it be a speed tie?
Due to Ditto copying all EVs and IVs, natures, etc. it's a Speed tie, if both are Choice Scarf.
It still depends, if they have the same EVs, IVs, and the same stat raising nature, then this is a repeated question. There is a 50:50 chance Ditto would go first. commented 19 seconds ago by ★~ProfDelldell~★
They're correct. It's a speed tie, so a 50:50 chance for Calyrex and Ditto, since Ditto doesn't copy the Speed boost from choice scarf, and since both are Scarfed, it's a tie. Hope this helps!