Item cards do have a named unique ability like characters
All Pokmon Card Set Symbols A full archive of every symbol released is maintained by fan sites and the official Pokmon website, updated with each new expansion drop
From a small sample, Lightning and Psychic Energy appeared the most often (in Gym Heroes it was Lightning Energy, Gym Challenge I did not look at)
Since Team Up is a modern release, most cards remain in decent condition, so you'll typically choose between lightly played (LP) , and near-mint (NM) copies
It negates all status ailments, which isnt really the focus of Standard at the moment, and it also deals damage based on how much energy is on other players Pokemon, which is usually only 1-2 right now
It pairs beautifully with high-cost instants like Rakdos's Return or even simple burn like Blasphemous Act, which ensures the damage piles up quickly