Odolwa is a giant warrior that wields many attacks. He can summon flame circles, tiger moths, and his own insects as well as use many sword techniques. The easiest way to defeat him is to run towards him with the Bunny Hood equipied and slash at his legs. The arrows will also stun him. When he summons moths use a bomb flower or bomb to lure them away.
Use the Zora Boomerangs (or Fierce Deity Mask) to attack it. When it's hit two times, it will call the boss remains to attack. Take them out and then focus on Majora. When it uses a flame , use the mirror shield.
Probably the funniest boss in the game. All it does is run around and dance (occasionally attacking). Use Boomerangs or arrows to down him and then strike.