Monster Stats

For reference on stats, EXP, coins, resistances, weaknesses, anything about any enemy in the game:

http://www.mariowiki.com/Super_Mario_RPG:_Legend_of_the_Seven_Stars_bestiary

Hammer Bros seems to be missing, here are their stats (taken from here):

HP:50

Attack:6

Defense:13

Magic Attack:6

Magic Defense:8

Resists: Nothing

Weak to: Jump

EXP: 6

Coin: 20

Item drop: Flower Jar