Yes, you can. Though it's much easier and faster to catch a Wailmer by fishing.
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You can capture wailmer in ruby, sapphire and emerald on most routes where water is you can find either by using a rod or by using surf.
In emerald, there is a slim chance you'll catch one in Route 129, but the easier way is to catch a Wailmer and evlove it.
you can get your wailmer to evolve by:1.train it to level 40 2.trade it to a friend then trade back.(you catch wailmer by surfing around Undella Bay)
Rather than catching a Wailmer at Lv. 40, you can find one by surfing on Route 129 or Fishing on Route 136 with the Super Rod. (though they're very rare, I'd say evolve Wailmer) You can catch a wailord at route 129 by super rod. Their level could be very high, although i met a lvl 28 wailord there by accident.
I am looking to join Wailmer to my team.But, no you can't catch it with an old rod