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It all depends on the moral structure of the story. At the heart of every story is a choice about values. (With great power comes great responsibility, etc.) The more conventional structure would...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/35447 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It all depends on the moral structure of the story. At the heart of every story is a choice about values. (With great power comes great responsibility, etc.) The more conventional structure would be to build up to by focussing on the choice that the hero has to make in order to fully realize their power. But an alternative structure would be that the sudden granting of power creates the conditions in which the hard moral choice must be made. (Spiderman gets bitten by radioactive spider, not as a reward but as the initiation of all the moral choices that he must face afterwards.)