You can't, you have to trade with Ruby. Seedot/Nuzleaf/Shiftry are Ruby-only Pokemon.
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Nuzleaf only evolves by use of a Leaf Stone, so it can evolve at any level.
you get a nuzleaf on route 229 (8%) or solaceon city side (4%). to get seedot breed nuzleaf or shiftry
route 229 (8%)
Lucario isn't in Sapphire,Sapphire is a Hoenn pokemon,Lucario is a sinnoh pokemon.
Nuzleaf is evolved with a Leaf Stone.