You can find Nuzleaf on Route 114, but it's rare. It might be easier just to level up the Seedot you should have traded for in Rustboro City.
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Nuzleaf is evolved with a Leaf Stone.
Give him a leaf stone he will evolve
You need a leaf stone :)
You cannot teach Nuzleaf Razor Leaf in Pokémon Emerald because it cannot know Razor Leaf at all.
You can't, you have to trade with Ruby. Seedot/Nuzleaf/Shiftry are Ruby-only Pokemon.