Hey there @Labradorite, the new egg can be found in the following colors:



You're already doing great by sending out Magenta and Purple pets, since there are less hoard-findable eggs in that color, which means a higher chance of finding the new one. And as ShadowWolf said the new egg is pretty rare, so potions will help a lot (pixpet potion + pixpet rarity excluder is the best combo for this).

Edit: Also to echo what ShadowWolf said, WU doesn't apply to eggs, so you can send any pet as long as it's one of the colors mentioned.

Let us know if you have any other questions! :>