In tall Grass
You can't get growlithe in emerald so trade one from firered or Pokemon xd.
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I'd say Mareep, Totadile, Machop, and Growlith.
You can get growlith at route 201 and 202 if you have Pokemon firered insterted.
You could find wild Growlithes in Route 48.
You can't get a growlithe in Pokemon leaf green. You can get it in Pokemon fire red and trade that is the only way =) hope i help.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.