You go to the Rustbord Pokemart :) hope that helped
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get rayquaza
You can catch it when you use dive.
you cant get a timer ball in emerald
get a hm called dive attach it to a water type pokemon and go on water and use dive.
Dive is not an HM in leafgreen you can't get it unless you trade a Pokemon that knows Dive from ruby or sapphire or emerald but it will not work in leafgreen unless your in battle.