dive in the area left of Mossdeep and find the green shard. Trade it for a leaf stone. here is a map (copy and paste below) http://www.serebii.net/pokearth/maps/hoenn-rs/24.png the green shard is in the bottom part where the map is not shown
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go underground and look for them
Nuzleaf only evolves by use of a Leaf Stone, so it can evolve at any level.
The leaf stone will evolve certain species of pokemon
You get a leaf stone underground.
youcan not get shinys on Sapphire