First things first though
They are all Item cards that are technically considered as Pokmon when on the field
Were not exactly working with vanilla damage here: for GC, Acidic Drain not only does 30 damage but also Burns and Poisons whatever is unfortunate enough to be on the receiving end, while removing 3 damage counters from Victreebel at the same time
When it was in Standard back with Core Set 2021, it played a vital role in the Genesis Ultimatum shells, allowing you to kill out of nowhere
Salvage as much gear as possible through milling and retrieving, then equip it to gain powerful combat buffs, overrunning your enemies with ease
Despite its unique status, it remains an essential piece in the history of Pokmon card development