In Slime Mori Mori Dragon Quest 3: The Great Pirate Ship and Tails Troupe he can stretch out and strike enemies. Rocket also has a super slide strike where he charges, springs forward, and rolls right into enemies.
Rocket can also pick up objects to throw. Tossing rock-bombs is one way to clear walls. How a slime balances items on his head is a mystery to us.
Dragon Quest Heroes: Rocket Slime 3 is slated for release this year on Nintendo 3DS. As of now, Square Enix and Nintendo, publishers of Dragon Quest titles overseas, have not announced the game for North America.