I often use Yukari to train people, though. You've been warned.
"Train" in the sense of "improve the opponent's abilities and technique through practice", or in the sense of "hit the opponent with several tons of high-velocity metal"? With any other character I would know the answer, but with Yukari you never know...
Patchouli Knowledge avatar courtesy of the skillful Prime32.
"Everyone feels benevolent if nothing happens to be annoying him at the moment."
--C. S. Lewis
"The first person to prove that cow's milk is drinkable was very, very thirsty."