Scooby Doom: Scareturne
Type: Grass/Dark
Cacturne Variant (Honestly a Scarecrow Variant/convergent form would make sense for this Pokemon)
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The New Scooby-Doo Movies Episode 4 - ("The Frickert Fracas") Villain 'Scarecrow'
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Scooby Doom Au
The Scooby Doo episode has that someone has a secret chicken feed formula that could make chickens giant, so I would change the setting from a Chicken Farm to a Wooloo farm, as I could easily convert the formula that makes chickens temporary large as someone having discovered how to Dynamax a Pokemon outside the Galar region. Also I would replace the chickens with Wooloo as I can easily turn the Chicken chase scene into a Giant Wooloo ball of doom situation instead.
So for the Villain of the episode the 'Scarecrow' will be turned into the Scareturne an altered Cacturne that was assign the mission to spy on a farm so it's master could acquire how to Dynamax Pokemon outside the Galar Region. One could consider them to be a Shadow Pokemon.
Now While their are certainly elements of the episode I could change/convert to fit the Pokemon universe I was having issue with the guest star, their attire is similar to Steven Stone and I could say he's their because of the report of Kaiju sized Wooloo, but found trouble with how to have his character interact in the rest of the story also I wanted to keep it still in the Unova region. Then I debated about changing the farm to a Milktank one instead so I could make the guest star be Whitney (My idea would be that the farmer was a relative of hers and that's why she's in Unova) and have that their dealing with Kaiju sized Milktank instead, but that didn't sit right with me either. So I decided to put that on pause and read the next episode synopsis "Guess Who's Knott Coming to Dinner" and realized this would be another situation where I could merge the two storylines into one. As the villains in the story aren't interesting enough to design a fakemon on, but their gust star I could easily swap out as they remind me of the character Duplica/Copycat Trainer (Honestly I've always thought they were the same person) so that would be fun to have them in the story instead!
Sigh this was getting long again, why do I keep doing this to myself?