Looks like Goopy Arein has caught someone himself in his gooey, sticky embrace, slowly turning them into a gooey eevee pet!  And that unlucky soul is . . . 

. . . uh-oh . . .      
 
. . . Vee?    

Part 2:  https://www.deviantart.com/how2101/art/Catch-of-the-day-pt-2-802035782

Part 1:  https://www.deviantart.com/how2101/art/Catch-of-the-day-pt-1-801787165

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