Gen 1: Pidgeot, Arcanine
Gen 2: Lugia, Umbreon
Gen 3: Sceptile, Rayquaza
Gen 4: Drapion, Magnezone
Gen 5: Thundurus, Zoroark
Gen 6: Yveltal, Noivern
Gen 7: Lycanroc, Pheromosa
Gen 8: Obstagoon, Frosmoth
There are so many pokemon that I love especially in gen 3, 4 and 7 that I can't choose xD