try slateport city beach i found a lv40 wailmer on my first try with a super rod!
fish on route 223
Relicanth: Underwater Route O (rare) or Route S. Wailord: Use Super Rod to catch a Wailmer. Use the Search function in the Pokedex.
By fishing for a wailmer in the ponds in route 123.
Go to the Flower Shop on Route 104
Go to the Flower Shop on Route 104
route 129 use super rod
You must evolve wailmer/surf and find one on route 129. There are few there. Wailmer will evolve at level 40.
You can find Wailmer in the sea using the super rod in Sailport city, route 110, 127, 105 , Lilycove, Mossdeep, and elsewhere. These are the places I've found Wailmer.
Go to the Flower Shop on Route 104 Talk to the girl in the Flower Shop on Route 104
on the route that connects odale town and slataport town
You get wailord in route 129 or evolve your wailmer into a wailord.
route 223 - 230 super rod