You must trade it from Emerald.
You can find a shuckle in Pokemon Sapphire, Ruby, and Emerald in the Safari zone.
You find Shuckle on Route 224 after you get the National Dex and you have Pokemon Emerald inserted in Slot 2 on the DS.
Shuckle does not have an evolution.
Shuckle does not evolve.
You get a Shuckle.
In the Cave of Origin.
You find it in the team aqua hideout.
Shuckle Doesn't Evolve....
A Shuckle doesn't evolve
migrate from ruby,saphire, or emerald.
I think its the same place you find him in Ruby and Saphire
Shroomish is a rare Pokemon in Ruby and Saphire but you can find it in the Petalburg woods.