The general aka most common opinion is most likely to not use them. I don’t really agree with that though. If Thunderhorn was played in every deck ok, but he is not. I think i played 6 games yesterday using pokemon starhorn in diamond and i saw 1 deck with thunderhorn and that was your typical vanar control deck.
I also think that there is more than just thunderhorn that prevents the formerly common ooze and pax from seeing play. And that’s the simple fact that Obelysk Vet, especially slower midrange versions, don’t see as much play as they used to because of Aggro Cass and her Phantasms and in case of ooze because nobody is playing Creep atm. Pseudolukian posted his creep deck on reddit last week and he had ooz in it. Not that you have much choice if you wanna play creep anyway. There is only Ooz and Crawler and imo Crawler sucks even more due to the abundance of 1 damage pings.