Thx for the tag @0kamii, I thought for sure that Kangaskhan would top gen 1, look at that. Imma include all formats I've played in, which would be from about the end of VGC 2014 to now with VGC 2018, so not limited to the current format.
Gen 1:
is my gen 1 choice. Gengar would have been shared nmbr 1 if it would have kept Levitate, where as Zapdos is still as strong as ever. Zapdos is so increadibly versitile and its typing is really good aswell.
Gen 2:
is my gen 2 choice. It's one of my most favourite Pokémon conceptually. It has good support moves with monster bulk, and decent offense. Crobat and Murkrow are close seconds.
Gen 3:
is my gen 3 choice. Prankster with a major support movepool is amazing, plus STAB Foul Play hurts alot. Also, Prankster Recover is so satisfying. Sceptile, Gardevoir and Milotic are strong honourable mentions.
Gen 4:
is my gen 4 choice. Quite versitile between offense and defense, and I really like STAB Earth Power. Only one weakness coupled with Storm Drain makes this snail quite deceptive. Garchomp, Weavile, Magnezone, Rotom-W and Heatran are honourable mentions.
Gen 5:
is my gen 5 choice. Good offense and speed, aswell as prankster utility makes Thundurus very versitile. Although most gen 5 Pokémon are no longer as good as they were before, honourable mentions are: Excadrill, Vanilluxe, Hydreigon, Volcarona and Terrakion.
Gen 6:
is my gen 6 choice. This one is quite clear, I adore Gale Wings Tailwind as well as priority on Flying type Z-moves. Greninja, Sylveon, Klefki and Goodra are up there too.
Gen 7:
is my gen 7 choice. It's just amazing. Incredibly flexible. If it had maybe just base 80 or even base 70 HP, it would be my favourite competetive Pokémon. Oh well. Vikavolt, Mimikyu, Tapu Koko, Tapu Lele and Nihilego are honourable mentions.
Cheers
Gen 1:

Gen 2:

Gen 3:
![[Image: sableye.png]](http://pokemonforever.com/images/pokeimages/gen3/sableye.png)
Gen 4:
![[Image: gastrodon-east.png]](http://pokemonforever.com/images/pokeimages/gen4/gastrodon-east.png)
Gen 5:
![[Image: thundurus.png]](http://pokemonforever.com/images/pokeimages/gen5/thundurus.png)
Gen 6:
![[Image: talonflame.png]](http://pokemonforever.com/images/pokeimages/gen6/talonflame.png)
Gen 7:

Cheers
"To believe in an ideal, is to be willing to betray it"
VGC, Friend Safari, Masuda
VGC, Friend Safari, Masuda