Why are some Pokémon based on Ash's not on the Pokémon of the Year 2020 Any Top 30 Pokémon Lists

I have remember some of the Pokémon based on Ash's current and former official trained/bonded that have never climbed onto the Top 30 most popular Pokémon list by region during the Pokémon of the Year 2020 event, including Overall, Kanto, Johto, Hoenn, Sinnoh, Unova, Kalos, Alola and Galar & Beyond, include Butterfree, Pidgeot, Kingler, Tauros, Bayleef, Noctowl, Larvitar, Donphan, Swellow, Corphish, Torkoal, Glalie, Aipom, Buizel, Gible, Unfezant, Scraggy, Leavanny, Palpitoad, Boldore, plus Naganadel, while Butterfree and Naganadel are the Ash's only two former official Trained Pokémon that had later climbed to the Top 30 Pokémon List by region during the Pokémon of the Year 2021 event. So, I'm just wanting to know why you think that some species of Pokémon that based on Ash's current and former official trained/bonded on not on any of the Top 30 Pokémon List by region during Pokémon of the Year 2020 event? Please, let me know, thanks.😉