You have to advance the girls missions. For Izanami, go to the forest and touch the Katana. For Tsukiko, you have to advance Izanami's story to the point where you take her to a festival. You have to do this twice, and the second time you will find a rabbit. Follow it.
Abyssal The Watcher
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A member registered May 19, 2022
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You have to beat the second gym, and get the CUT item from the Cutter's house. After that go back into the forest and find the two small trees, use CUT on them and follow the path behind them to the end. You will find her pendant there. Bit of advice though, bringing a good ground type if you can, or a lot of high LV pokemon. You may need it.