Yeah, I remember when Hareta challenged a TV reporter to a battle (After hanging on a camera that broadcasted to a huge TV in the city), and then throwing his Pokeball, which landed, umm, ON the cameraman, and Mitsumi ran over, embarrased.
And also once when Jun asked Mitsumi out to dinner, and Mitsumi said "Eat this!" and raised a bruise on Jun's head while he said, "Yummy"
And also when the Team Galactic grunt had caterpie use String Shot to tie up Hareta, then Hareta inched towards him like a Caterpie and bit his "buttocks".
Also, Gardenia said that Hareta was stupid to take on people much stronger than himself, and he burst out saying, "I don't care if I'm stupid! I'm going to keep getting stronger and win! Right, Piplup?"
And also in the fifth volume when Hareta climbs up a Hydro Pump to tell Cyrus to butt out and let him battle, and the Hydro Pump died and he was just like *plop* "Ooooooppppssss..."
But he shows heart in the fourth and fifth when he says that his only pokemon left aren't Regigigas and Piplup, Mitsumi's facing three opponents- Regigigas, Piplup, and... Hareta!