How to Find: Riolu with Prankster

For this one youll need two specific Pokemon.\r
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1) A Ghost Pokemon with False Swipe, and then 3 other attacking moves of your choice.\r
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NOTE: I forgot Decidueye existed. That works too. Oops..\r
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2) Mismagius/Misdreavus that has the Egg move Skill Swap (breed with Solosis)\r
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Solosis can be caught via Island Scan\r
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The strategy is pretty simple from there. Send in Marowak, KO the first 10, swap in Mismagius, and then use Skill Swap to check each new Riolus ability until you find one with Prankster. \r
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Good Luck!