Final answer:
The best technique to communicate the main character's realization in Ryan's story is an epiphany, which generally takes place during the story's climax.
Step-by-step explanation:
Ryan is writing a story where the main character realizes that the only way to overcome evil is with good. The technique that would best convey this message is an epiphany. An epiphany typically occurs during the climax of a story, which acts as the turning point. It can take the form of a profound realization or insight that the protagonist experiences, causing a significant change in their viewpoint or approach. This personal revelation aligns perfectly with the scenario described, where the character grasps that goodness is the key to overcoming evil.