You walk through the Lighthouse door in Olivine. Is it really not obvious?
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Nothing at all - it's just a fixture that you can't enter and can't manipulate.
Go to saffron in kanto and it is somewhere behind the pokemon center
The old rod is south of the city with the Sprout Tower in a Pokemon Center The Good rod is in the city with the Lighthouse in a house with a fisherman who gives it to you (i think)
you walk there
Its simple, when you enter the town you go up the 1st lot of stairs onto a big solar panel pathway just keep following that path to the right and you should be at the lighthouse. if he ain't there then tough.