Go to Route 120 and go south. Cross the bridge, and you'll see Steven. After a battle with his Kecleon, he'll give you the Devon Scope. It alows you to see any unseeable Pokemon. Now go back to the gym in Fortree City, and press "A" to the place where you can't get in. The Devon Scope is automatically used, and you'll see a Kecleon getting away.
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Catch three other Pokemon in the Ruby course and you will be given a bonus. take the bonus, and it will be keckleon. if you beat the challenge a certain amount of times, you automatically catch keckleon.
beat the grunts
to get past the wailmer go to mt. pyre (if not already done) then goto mt. chimney
Did you set it on Wombo?
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.