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