Bionicle Heroes - Play as Vezon

Defeating Guhhrahk:
The best Toa for defeating Gurrahk level 1 are Matoro for beating Guhhrahk Hajli and Jaller for killing summoned enemies.

Defeating Vezon:
After defeating all Piraka, you will have to fight Vezon for the last time. First hit him the back, then in the legs, then the heads, then Vezon