After I defeated Willowisp in the Battle Coliseum it dropped

[item2=Wispling] & [item2=Potion Egg]

buuuut... wth is this Potion Egg? I can only Feed/Use it on my Pet and I am scared to just up & use it. :x

I'm pretty sure it's just a stat booster if you use it

You get the eggs (there are several different ones) from different battle opponents. They can only be used with pets tiers 1-3.

When used on a tier 1-3 pet most will add 1-3 points in a stat. The potion egg adds health. You can see all the eggs and what they give at this SubetaLodge link.

They can be "fed" to any tier pet and it acts as a normal food.

Thank you for clearing my confusion :)!