Gen 1: Ninetails

Gen 2: Houndoom

Gen 3: Mightyena

Gen 4: Lucario and Skuntank currently are tie

Gen 5: Zoroark

Gen 6: Delphox

Gen 7: Lycanroc

Gen 8: Thievul

Gen 9: Koriadon

1: Haunter

2: Quagsire

3: Salamence

4: Palkia

5: Genesect

6: Greninja

7: Zeraora

8: Dragapult

9: Koraidon

I'm not experienced as to what pokemon are in which region

All I know is Blacephalon is the best Alolan pokemon

Toxtricity is the best Galarian pokemon

Garganacl is the best Paldean pokemon

Idk the other regions too well