This is the second boss in the game. You will unlock this trophy for defeating him.
To defeat him you need to hit him with the TNT. So you have to time the activation point and hope it is next to him when it blows up. He will follow a set pattern each time, so stay off the squares he uses to avoid taking damage.
1. His first pattern goes from bottom left, to middle, to bottom right and back to middle, then bottom left.
I found activating any box in the middle seems to get him. He goes there quickly enough to be caught in the blast.
2. His second pattern goes from middle, to middle left, to bottom middle, to middle right and then back to middle.
I found activating at the middle left point just after he jumps to the bottom middle will get him.
3. His third pattern goes from bottom middle, to middle left, to top middle, to middle right and then back to bottom middle.
I found you should activate a box when he is 3 squares away.