Hey @Skylark-Starflower! Here's the location info I found on the wiki (thank you wiki contributors!!):

• Vivid Shluppbun: Barrow Woods Forest Edge, Past Midnight


• Vivid Drax: Barrow Woods Forest Edge, All Night


• Vivid Ponyata: Hidden Lagoon, Pre-Midnight


• Vivid Altudrax is a non-catchable boss encounter in Homely Hamlet, but if you still want to check it out you can start the quest at Homely Hamlet Fishing Grounds.

Let me know if you aren't able to find the locations and I'll try to give directions. :)

Edit: Forgot to mention that to obtain Vivid Altudrax, you'll need to complete a quest in Homely Hamlet where an Altudrax asks you to count wooden planks, and then he'll give you the Indigo Scale (Vivid Drax's evo ingredient).