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Peunut butter jelly time
you have to beat the elite four, and get the national dex. then go to cerulean city, go past the nugget bridge, and surf on the water. there is a cave,and its cerulean cave
you throw an apple at the voltorb near the rocks , at the end of the cave , to get the apples you have to take pictures of Pokemon after the cave level
The Pokemon Lapras a water type Pokemon is the 131 Pokemon on platinum and can be found on Victory Road after getting past the guy standing in front of the doorway inside the cave.
Go to the right of Azalea town past the cave with the slowpoke once you head down past that you should see a cave it will say route 33 this is union cave
you go past the moon cave.
Past the cave to the west of cainwood city.
Go through the cave
Just past victory cave
You push boulders into a bunch of holes to stop the flow of water (you need strenth)
go to the hideout, the opening in that cave north of the wailmer
you have to swim around him