There's not really an easier method for finding Audino more often than you already are. My only suggestion is to go somewhere where you know Audino appear (Route 1, Pinwheel Forest, etc.) and use repels to walk around until you see shiny grass.
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You have to find a patch of grass that shakes on its own. Go to that patch of grass, you will find often find Audino or Pansage.
Audino does not evolve
Audino is one of the many pokemon that does not evolve!In other words you cannot evolve Audino!
audino can't evolve, sorry about that.
the easiest way (without hacking rare candies) is to beat wild pokemon, specifically audino because they give out more exp. points than regular pokemon. just run back and forth near some grass with high level pokemon and once you encounter a shaking patch of grass, it will most likely be an audino.