There are two ways to get Wailord . The first and easiest way is to get a Wailmer. Level it up to level 40, and it will evolve. The other way is to surf around route 129. If you do it this way, it will probably take you days to capture it, so I do not recommend it. Wailord is a Pokemon needed to find the Regis Trio.
Answer
Wailmer can be caught by super rod in most water spots and just evolve it. (lv 40)
Answer
There is a very slim chance that you can catch Wailord use a super rod on route 129. The best way to getting a Wailord is by catching a Wailmer by using a super rod then evolving it. It evolves at level 40.
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Evolve a Wailmer (Level 40)
You Can't
Swampert or Wailord.
Wailmer evolves into Wailord at level 40.
Get relicanth and wailord. Put relicanth in the first slot and the wailord in the last. Then make a pokemon who has dig use dig.