Lake Mungo is purely fictional. It doesn't draw from real events. The story is designed to engage viewers with its suspense and horror elements rather than being rooted in truth.
In a way, it is. The movie takes some cues from real-life occurrences and builds a fictional story around them. However, it also adds fictional elements for dramatic effect.
Bolts could be a new and original Pokemon created by the fanfic writer. It might have unique abilities and characteristics that play a role in the forbidden love story.