After you beat Mossdeep City gym, go to Rustboro City, then go east to Rusturf Tunnel, and there should be a guy in green just outside who looks like he's from Devon Corp. Talk to him, and he will give you a repeat ball. Now return back to Rustboro City and enter the pokemart. Now you have unlocked both Timer and Repeat balls. Both cost $1000 each.
Timer balls are great to catch legendaries including relicanth and are more likely to succeed with each turn!
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Go to Rustboro City, and enter the Poke Mart... There you can buy Timer Balls...
you cant get a timer ball in emerald
Rustboro city, where else...
A timer ball in ruby? i thought that was only diamond and pearl!?
No one.
In Pokemon ruby you can catch latios but not latias, in Pokemon sapphire you can catch latias not latios, in emerald you can choose. Use your master balls on them so they wont fly away. You can use other types of balls, eg timer ball, ultra ball, or great ball on the other legendaries.