Routes 102, 111, 114, 117, and Petalburg City by Surf.
Routes 117 & 120 in the grass.
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Find a Marill in the wild and evolve it into an Azumarill. I think Marill evolves around level 25. marill evolves at level 18 in sapphire
Theres a pretty sweat glitch, you have to find the white rock outside the space station clikc on it 7 times and then find the nearist rock and run round it 20 times, do this 5 times and then the next pokemon you get will be a Marill
In the waters of the safari zone
By going to the mountain between Ecruteak City and Mahogany Tow, you will find Marill. Although Marill appears only 10% of the time in the cave.
You cant. You need to trade it from Ruby, sapphire or emerald version.