You have to go through the hideout which is the cave slightly north of the wailmer. In the hideout you have to beat the admin at the end and see the submarine sail away, you can also get a masterball in there too
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From lilycove city if you go east you can reach mossdeep city.
In lilycove city.
You can fish a staryu in lilycove city.
Buy it at Lilycove City MegaMart
In Dewford Town, you can use your super rod to catch a level 20 - 45 Wailmer. In Lilycove City, you can use your super rod to catch a level 25 - 45 Wailmer.