i want to know who and how help cole to change him

Edwin and Garvey certainly help Cole along the way. THey take him to the frozen pond, they teach him the wolf dance, and teach him to honour his ancestors. They help Cole by giving him the tools to break through his anger and self-loathing.

Then,did the spirit bear help cole

Sure, the bear taught Cole respect. It taught Cole that his manipulations and games have no power in the circle of life.