Hmm, but it’s pink & the shiny is clearly supposed to be purple. It seems more like the pink Butterfree from the anime or the purple Kecleon from Mystery Dungeon. These aren’t considered shinies so Train is kind of right in a way.
Always sorta disliked these up for debate shiny cards. Just make them official shiny cards lol.
Resurrecting this thread to pop one in that kind of fits: Base 1st edition/Shadowless Venusaur.
The green body & orange flower on the card fit how they later decided to depict Venusaur as a shiny in G&S. Possibly the inspiration for the colour palette, perhaps?