Friendship is a common theme. Since they are friends in the original, fanfictions often explore different aspects of their friendship, like how they support each other through tough times.
One great 'Scott Pilgrim x Wallace Wells fanfiction' could be about their adventures in a parallel universe. In this story, they might discover new powers and have to fight against an unexpected villain together. It could show their relationship evolving from just friends to something more complex.
I'm not entirely sure specifically what 'wallace' refers to in 'wallace pulp fiction' without more context. It could be a character's name, an author's name, or something else related to the story or the work in general.
Maybe Wallace is a character in a local legend. He could be a hero who saved the village from a disaster, like a flood or a fire. He might have risked his own life to ensure the safety of others. This would make him a 'good people' in the eyes of the villagers and thus be part of the 'good people Wallace' story.
He might be a figure who has developed a body of work within the realm of 'fantastic fiction'. Maybe he has a distinct writing style that sets his works apart. He could be known for creating engaging characters and settings in his stories, all of which contribute to the 'fantastic' nature of the fiction.
Harrison Wells isn't part of the comic world. He's unique to the TV adaptation. The show introduced him as a new element to the story, separate from the comic source material.