I'm pretty sure that you at least need the good rod. The old rod only captures Magikarp.
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You can catch feebas everywhere and occasionally barboach i am unsure where to catch magicarp but there is a way
I am looking to join Wailmer to my team.But, no you can't catch it with an old rod
Actually scrap that,you need the old sea map to get there but you have to trade it with someone who has the old sea map on Pokemon ruby/sapphire
Gengar is a powerful ghost type of Pokemon. In Pokemon Platinum it is possible to capture one by going to the Old Chateau.
to get surf in sapphire you have to go and beat your dad.then go next door to the left.that is wallys house witch you will need to get surf,but you will need to talk to the old man i belive it is.