You're missing the point. It's not a one time thing. Evidence existed, that evidence was found, and that's what made it change to being accepted.
That evidence still exists, so if you claim dinosaurs don't exist, we can just point to the evidence that still exists. That evidence didn't get spirited away like golden plates to heaven. We're still finding dinosaur bones.
If you claim dinosaurs don't exist, I would point to the wealth of evidence that they do. If you were raised in some religious cult that never taught anything about dinosaurs and taught that the Earth was 6000 years old, and therefore didn't think giant creatures existed hundreds of millions of years ago, it would absolutely be on the person claiming they exist to show you dinosaur bones. Which is evidence.