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1. clear out a large area, preferably the whole jungle
2. collect leaves while doing so
3. make it one flat space
4. put 1 layer of leaves on it
You can use the wood you collect while clearing the jungle to make the platform and therefore the leaves won't disappear because they are next to wood.
Maybe this also helps you : http://pixelmon.wikia.com/wiki/Scyther
This is what my testing grounds look like, a 5x5 chunk with 8 chunks covered in 2 layers of jungle leaves. I have noticed more spawns taking place now i have increased the size further. I will be testing with jungle tree's as well to see if there is any influence.