Maybe Harry is under the influence of some dark magic or a powerful enemy who has tricked him. This enemy could have planted false memories in Harry's mind about Dumbledore. So, Harry, believing these false memories to be real, starts to expose Dumbledore as a villain based on these false recollections.
Perhaps Harry has been misled by someone he trusts. They could have filled his head with lies about Dumbledore, making Harry think that Dumbledore is actually a threat. And his motive would then be to protect the wizarding world from what he believes is a hidden danger in Dumbledore.
Yes, there might be. The Harry Potter fandom is vast, and there could be fanfics with all sorts of creative and sometimes controversial plotlines like this. However, not all such fanfics are easy to find or of high quality. You'd need to search on popular fanfic platforms like Archive of Our Own or FanFiction.net.
In fanfiction, Harry might use his knowledge of the secret passages in Hogwarts to hide from Dumbledore. He could also use Polyjuice Potion to change his appearance and blend in with other students or people in the wizarding world. Sometimes, he could even ask his friends to create distractions so that he can slip away and hide. For instance, Ron and Hermione could start a commotion in one part of the castle while Harry hides in a different, more secluded area.
The power dynamic also shifts. Usually, Dumbledore is seen as a mentor and a figure of authority. But when Harry denounces him, Harry is challenging that authority. In some fanfic, this could lead to a power struggle within the wizarding community as others take sides. It can also cause Harry to seek new allies who share his view of Dumbledore, changing the social fabric of the story.
Dumbledore, as Harry's guardian in the fanfiction, would probably use his influence in the wizarding world. He could make sure that Harry is taught by the best teachers at Hogwarts. He'd also be there to offer advice and guidance, especially when Harry faces challenges like dealing with Voldemort or other dark forces. For example, he might teach Harry some advanced defensive magic privately to better protect himself.
In a 'Harry framed Dumbledore' fanfic, a motive could be revenge. Suppose Dumbledore made a decision that Harry thought was wrong and cost someone Harry loved dearly. Harry could then be driven by revenge to frame him. Also, it could be a case of Harry being under the influence of a dark force. The dark force might convince Harry that Dumbledore is a threat and needs to be removed from power, leading Harry to frame him.
The relationship would become very strained. Harry's rejection would likely make Dumbledore re - evaluate his actions and how he has interacted with Harry. Dumbledore might be shocked at first, since he probably thought Harry was on the same page as him most of the time.
As the story progresses, Dumbledore might try to make amends. He could start revealing some of his secrets to Harry in an attempt to regain his trust. Harry, on the other hand, would be hesitant at first but gradually start to listen and understand Dumbledore's reasons.
In some fanfics, Harry might hate Dumbledore because he feels Dumbledore has been using him all along as a tool to defeat Voldemort. Dumbledore has been making decisions for Harry without fully considering Harry's feelings and desires. For example, he didn't tell Harry about the prophecy until it was almost too late, and Harry might see this as a form of manipulation.
The fanfic changes the perception of Dumbledore's character in that it shatters the image of his infallibility. He is no longer the perfect headmaster and guide. Stealing from Harry shows that he is capable of moral wrongs, and this can lead to a more nuanced understanding of his character, where he is not simply all - good or all - bad but a mix of both, with his own motives and desires that might not always align with what is best for Harry.