BunteSmaties

The Alolan Pikachium Z can be found in a cave in the northern most diving area in Azurine Lake. You will have to hug the beach on the west of the lake until u find urself in the north-western most part of the lake. There in the great diving area (where u also gain Mudkip) u can access a small cave with a level 100 Pyukumu and using Blizzard u can access the Alolan Pikachium Z.