Most pet guides will tell you that if a costumed pet comes in a potion you must go by the potion price not the LE creator+costume. Below is my attempt to track some of the potions.

Angel Chibs Potion -none in trades
Baby Ercuw Potion-1 not priced in trades
Baby Huthiq Potion-none in trades
Eleka Viotto Potion-3 not priced in trades
Elf Ercuw Potion-none in trades
Fire Ercuw Potion-none in trades
Fire Quell Potion-none in trades
Halloween Ercuw Potion-none in trades
Halloween Poera Potion- 4-5 million
Ice Viotto Potion- 9 million
Mermaid Ercuw Potion-none in trades
Mermaid Huthiq Potion-none in trades
Seasonal Chibs Potion-only 1 in trades asking 200million
Water Chibs Potion-1 in trades not priced
Wizard Ercuw Potion-none in trades