In order to unlock the final level of Pokemon Snap you'll need to find all 6 Pokemon Signs. There's one sign for each level before Rainbow Cloud.
As you enter the stage immediately turn around. As you proceed through the beginning of the stage, you should be able to snap a picture of a rock that looks like a Kingler.
As your go through the first of the metal doors in this stage, you will see a pikachu. As you are rolling along, lure the Pikachu to the giant egg like object, and play your Pokéflute. This will cause Pikachu to use thunder shock, which serves a duel purpose. Not only will you be able to catch a rocking picture of Zapdos, but Zapdos’s electricity awakens the power plant inside the tunnel! As you are almost out of the tunnel portion of the area, you will see a pattern on the wall created by lights. This pattern is in the shape of Pinsir, and is your second Pokemon sign!
After you have been dropped into this stage, you will see a volcano off to your left that is shooting out circular smoke patterns. Throw a pester ball into that volcano and the smoke patterns will appear as a Koffing, Aka. your third Pokemon sign!
A decent way through this stage, you will see a plant like object puffing out smoke and obscuring your view of the object behind it. Play your Pokéflute and a Vileplume will awaken! More importantly though, the Cubone shaped rock formation behind Vileplume has been revealed! Snap it quickly before you’re out of range!
As you are entering an area with Weepinbell pacing around a pool, turn to your left until you see a collection of lights, photograph it, and during Oak’s check it will be a picture of Mewtwo, as well as your fifth Pokemon Sign!
The final Pokemon sign is seen immediately after entering this course, and is a large mountain in the shape of a Dugtrio.
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