nowhere, find a green shard and bring it to the shard hunter near mossdeep city...
he will trade it for a leaf stone
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Go to liyovile city and then go to the general store and buy it
buy them
If you mean evolution stones. You can buy them at the shop in Celadon
You can't. In Ruby, Sapphire, and Emerald you can only buy items, TMs and dolls.
Zangoose does not appear in Pokemon sapphire, but you CAN get it. To get it, you must trade Pokemon with your friend if your friend has Pokemon ruby which is the only game you can get zangoose in. Or you can just buy Pokemon ruby.