Evolving Grimer into Muk
Muk might not have been a very popular Pokemon, but the secret to photographing it in Pokemon Snap was so obscure that even to this day there is conflicting information online about how to do it.
In the Cave course, there were two Grimer hiding in holes in the walls that you could snap a faraway picture of. Most people would probably think to take a photo of the closer one and be done with it.
But if you took a photo of both Grimer, a third one appeared a bit later in the course in the perfect spot for a close-up shot. But that’s not where the secret ended.
If you threw five Pester Balls in a row at that particular Grimer, it would evolve into Muk, and you had a small window of opportunity to photograph it. It didn’t help that you had to turn the vehicle around to look behind you in order to see it, which made it a tough capture.
