This trophy is very simple. The goal is to win a Struggle match with all 200 orbs.
If you're lucky enough, you could obtain this as Roxas at the beginning of the game. I'd say to watch your opponents patterns and learn when to go in for a hit.
If you're not so fortunate to earn this during Roxas' missions, it's not hopeless.
You'll return to to Twilight Town as Sora later in the game and you can easily earn this trophy with him. Sora is more agile, and he has more combos, thus racking more orbs up.
I got this trophy by fighting Hayner when I was going for Jiminy's Minigame trophy. It took maybe 10 seconds.