What does the item Shinwas Rose do to your pets? I noticed there was a use option

It's a stat booster. :) It will give 1 Strength and 1 Defense to the pet of your choice. Only useful if you're into battling on the site.

Raises your pets strength and defense by 1 each.

@Jammin

Oh, ok thank you very much :]

Your welcome. You can always look on Subeta HQ if you ever need to know what an item does :)