Well You catch Magikarp, Goldeen, Finneon, Psyduck.
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you can find feebas on the way to catch garitina diaogia and palkia you need to use a good rod to catch him
In Pokemon Pearl, the Good Rod is given to the player by a fisherman on Route 209. he will ask the player a question and if they answer 'yes' then he will hand over the Good Rod.
goldeen is one of the Pokemon
yes you can cath more than a magicarp with the old rod but the only other thing you can catch with it is a feebas you can also on Pokemon heart gold ( don't know about soul silver) catch a polywag ^^
for me the best Pokemon you can catch with the good rod is carnavina.the rest are magicarp,goldeen and psyduck(psyduck is found in the safari zone)