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Munchlax evolves into Snorlax via max happiness in Pok
In Pokémon Pearl, Skorupi will evolve at Level 40.
There are secret bases in Pokémon Ruby Sapphire and Emerald. In Diamond Pearl and Platinum, you have underground bases.
In Pokémon Diamond and Pokémon Pearl, after encountering an overworld sprite of Cresselia on Full Moon Island, she wil fly off and upon her flying off, she will drop an item behind and the item that she drops off is the Lunar Wing item.
No, you cannot trade Pokémon from Pokémon Diamond over to Pokémon LeafGreen.