Which yeah, that’s something of a use, but there’s very few Pokémon that Chien Pao / Baxcal would want for that reason right now. Maybe down the road where there’s more stuff worth hitting for weakness. If anything, this is best for dealing with tank decks, and it’s still competing with other cards for that role.
Currently, all you’d have that could reasonably hit for weakness is Dialga VStar, Genesect V, Forretress ex, Toedscruel ex, and Wo Chien ex. That’s being very generous with what to expect, and Genesect is just as easy fodder attacking with Chien Pao. You can’t even claim Copperajah ex for that hitlist because Copperajah only takes 290 damage from 1 hit.