Wailord is not a legendary pokemon. Legendary pokemon are pokemon that typically play some role in the story, and can not evolve from anything or into anything. They also can not be hatched from eggs. Wailord plays no major role (if any) in the main stream pokemon games, and it evoles from Wailmer. Therefore, wailord is unable to be classified as a legendary pokemon. While wailord can be difficult to find in some generations and is often considered powerful and cool, it is not a legendary pokemon.
I wrote this answer to help explain to my cousin that wailord is not a legendary even when he insists that it is for various reasons. I hope this was helpful and help led you understand legendary pokemon as a whole.
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wailord is in undella bay
Wailord is the largest Pokemon followed by groudon.
Easy... Wailord
Wailord is #321 in the national pokedex, and it is a Water type Pokemon.
You cannot catch Wailord. You can, however, catch Wailmer, which evolve into Wailord starting at level 40.