Talk to Officer Jenny outside the Pokémon Center in Findale Harbor
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Go to the Findale Poke Mart and talk to the Mart NPC's
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Stanley will be acting strange, use Joe's special code word to see what's up.
Codeword: /Jackfruit
Turns out he was a ditto all along, now defeat the Ditto in a battle then tell Joe what happend
Return to Officer Jenny at the Pokemon Center for your second suspect. Appearntly Aunt Cassie has been acting strange, will be found by the largest tree in Findale
Talk with “Aunt Cassie”… then defeat the Ditto
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Return to Officer Jenny for your 3rd suspect. Officer Jenny will tell you that one of Professor Hemlock's assistants has been acting strange lately and you should check up on him.
Follow this path to arrive at the lab
The lab is the building next to the Eevee Statue
Go inside and chat with Professor Hemlock
Follow the stairs up to find “Scientist James”
Talk with “Scientist James”… defeat another Ditto and tell the Professor
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Return to Officer Jenny for the 4th suspect. The 4th suspect is Officer Jenny's son, he is standing next to the water fountain at Findale.
Battl Oliver
Report back to Officer Jenny for your 5th suspect. One of the sailors has been acting strange, so talk to Sailor Jeffery on the docks of Findale.
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After talking to Jeffery, turn around and speak with “Sailor Hilda”… defeat the Ditto
Return to Officer Jenny for the final suspect. Look for Robert near Aunty Bibby. Aunty Bibby is across from the bike shop.
Speak with Aunty Bibby
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Report back to “Officer Jenny” for the final time
(Wait… it's another Ditto)
Defeat the FINAL Ditto
Speak to the real Officer Jenny near the water fountain to complete the quest
That's it, congrats