Around the bay are a number of dark water patches; if you use Dive (obtained from Undella Town) above the patches, you can reach the **Abyssal Ruins** .
If you’ve been to Route 17 you should be familiar with how water routes work. This time there are no ocean currents to throw you off course, but you may notice some peculiar dark patches of water. Hopefully you grabbed HM06 Dive while in Undella Town because you’ll be needing it.
Besides being a great training spot for Grass or Electric Pokemon due to the abundance of Water-type trainers and wild Pokemon, Undella Bay is also the entrance to the mysterious Abyssal Ruins . Simply manoeuvre onto a dark patch and have your Water-type Pokemon use Dive to get in.
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