Avatar: The Last Airbender Hints for Nintendo DS
The second boss uses his basic attack and his second attack which can only be blocked by aang's/ katara'a SPECIAL defense so make sure you use your special defense or you will find that you die a lot
Ok, so, I'm not really sure about this, but I think I know how to get every character's last move. You have to find scrolls, which are hidden in levels. You get Katara's healing move from the waterbending scroll, which is on Four Paws Island(or something like that). The other two scrolls are for Aang and Haru. I'm not sure where they are, though, so seach the all the levels. You can buy the bomb for Sokka at the store on the last level for 900g.