Go to Marvil city and go to the weeds where the daycare center is at and run around through the weeds and after a little bit of searching you will find a Maril!
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by fishing or using surf
Fishing on Route 102 you can find Water pokémon that can learn Surf.
You must use Surf. Which can be given to a water Pokemon. Go to the edge of the lake (Like your fishing) and press "A" it will say: The water is a deep blue color, would you like to surf on it? Say yes. But this will only come up if you have a water Pokemon with surf on you.
You get a water type pokemon by chose totodile and teach him surf or fishing. P.S.-you can find old rod in 32 route in pokemon center,tak to the fisher.
The fishing in any pokemon game is random. you may catch a fish or you may not. just keep trying your luck! It's better to just teach a pokemon surf and swim in the water.