>>18686038Super Training takes lots of time if the pokémon is not already EVsed, since you need at least 1 minute for only 4 EV.
Since you can easily find hordes with Sweet Scent Macho Brace/Power Item is still more efficient because you spend less time and still get more EV.
The Super Training is more useful for the items than for the EV training; unless you don't need some strange EV spread for level 50.