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Couldn't find anything in NBTexplorer.
You need to edit the database in order to edit the spawn rate of the pokemons and where they spawn.
You don't need NBTEdit to edit pokemons you need H2 Databse.
NBT Edit isn't compatible with the new int[] tag and the current equivalent NBT Explorer doesn't seem to be able to edit the pokemon themselves. I'm fine with waiting for PixelExtras I was just wondering if there was a method at the moment.