My guess is that the hacker thinks that EVs in general give the player the advantage, no matter whatever stat they end up in. Because mostly all of a Pokemon's stats are going to be useful in some shape or form. For example, a Blaziken would especially enjoy attack and speed, but hp, special defense, and defense are also useful in the situation it would have to take a hit. Even special attack might be useful should it run a special fire move.
The only way that EVs will be useful is when they are put into an irrelevant attacking stat, such as special attack for Gliscor. And unless someone really tries to, he or she probably won't get a large majority of EVs there.
I think that's what the hacker was thinking when he made macho brace available, and having difficulty patches without EVs. It's not about choosing which stat the EVs are dumped into, it is the matter of gaining EVs in general.
That's what I'm understanding.