What Region has the most Uber and OU Pokemon in it?

Question

I don't really like competitive play, so this is more of a sheer curiosity question.
What Region has the most Uber tier Pokemon? What Region has the most OU tier Pokemon? What Region has a Pokedex that is considered the best competitively?

Comments

Are you asking about the Pokémon introduced in each region or the Pokémon from each region’s Pokédex?

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Counting forms?

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You should weight this according to the amount of Pokémon in each region — or else I’m confident Gen 5 is your answer without even looking.
Alternatively, Gen 4 if you count forms because of Arceus.

Answer 1

OU

• Kanto: 9
  Mega Venusaur, Mega Charizard X, Clefable, Mega Alakazam, Chansey, Mega Pinsir, Mega Gyarados, Zapdos, Mew

• Johto: 4
  Mega Scizor, Skarmory, Tyranitar, Mega Tyranitar

• Hoenn: 10
  Mega Swampert, Pelipper, Mega Sableye, Mega Mawile, Mega Medicham, Mega Latias, Latios, Mega Latios, Jirachi

• Sinnoh: 7
  Mega Lopunny, Garchomp, Magnezone, Tangrowth, Mamoswine, Rotom-Wash, Heatran

• Unova: 10
  Victini, Excadrill, Amoongus, Ferrothorn, Bisharp, Volcarona, Tornadus-Therian, Landorus-Therian, Black Kyurem, Keldeo

• Kalos: 6
  Greninja, Ash-Greninja, Hawlucha, Zygarde, Mega Diancie, Hoopa Unbound

• Alola: 10
  Toxapex, Mimikyu, Tapu Koko, Tapu Lele, Tapu Bulu, Tapu Fini, Celesteela, Kartana, Magearna, Blacephalon

Uber

• Kanto: 5
  Mega Gengar, Mega Kangaskhan, Mewtwo, Mega Mewtwo X
  Mega Mewtwo Y

• Johto: 2
  Ho-Oh, Lugia

• Hoenn: 14
  Blaziken, Mega Bkaziken, Mega Metagross, Mega Salamence, Kyogre, Primal Kyogre, Groudon, Primal Groudon, Rayquaza, Mega Rayquaza, Deoxys, Deoxys Attack/Speed/Defense

• Sinnoh: 26
  Mega Lucario, Dialga, Palkia, Giratina, Giratina-Origin, Darkrai, Shaymin-Sky, Arceus (all types)

• Unova: 5
  Reshiram, Zekrom, Landorus, White Kyurem, Genesect

• Kalos: 4
  Aegislash, Xerneas, Yveltal, Complete Zygarde

• Alola: 8
  Solgaleo, Lunala, Pheromosa, Necrozma Dusk Mane, Necrozma Dawn Wings, Ultra Necrozma, Marshadow, Naganadel

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Including forms that change stats and/or types, Sinnoh has the most Uber Pokémon, at 25.

Hoenn, Unova, and Alola have the most OU Pokémon, with 10 each.

Not including different forms, Hoenn and has the most Uber Pokémon, 7.

Not including different forms, Alola and Unova have the most OU Pokémon, 10 each.

Now, some percentages. (including forms that change types and/or stats)

Kanto is 5.4% OU and 3.0% Uber

Johto is 3.7% OU and 1.9% Uber

Hoenn is 6.3% OU and 8.9% Uber

Sinnoh is 4.7% OU and 17.1% Uber

Unova is 6.1% OU and 3.0% Uber

Kalos is 8.1% OU and 5.4% Uber

Alola is 9.6% OU and 7.7% Uber

Looking at the percents, I’d say that either Sinnoh or Alola are the best competitively.

edit: forgot about mega tyranitar

Comments

Sorry if the format is weird, I did this all on my phone. If it looks bad, tell me and I’ll fix it.

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give this man BA

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Wow, well done!

Answer 2

Heatran, Darkrai, Shaymin, and Arceus don't belong to any region, not even Sinnoh.

Kanto: 9 in OU (1/17)
Mega Venusaur, Mega Charizard X, Clefable, Mega Alakazam, Chansey, Mega Pinsir, Mega Gyarados, Zapdos, Mew

Johto: 13 in OU (1/19)
Mega Venusaur, Mega Charizard X, Clefable, Mega Alakazam, Chansey, Mega Pinsir, Mega Gyarados, Zapdos, Mew, Mega Scizor, Skarmory, Tyranitar, Mega Tyranitar

Hoenn: 14 in OU (1/14)
Mega Alakazam, Mega Pinsir, Mega Gyarados, Skarmory, Mega Swampert, Pelipper, Mega Sableye, Mega Mawile, Mega Medicham, Mega Latias, Latios, Mega Latios, Jirachi

Sinnoh: 14 in OU (1/15)
Clefable, Mega Alakazam, Chansey, Mega Gyarados, Mega Scizor, Pelipper, Mega Medicham, Mega Lopunny, Garchomp, Magnezone, Tangrowth, Mamoswine, Rotom-Wash

Unova: 20 in OU (1/15)
Clefable, Mega Pinsir, Skarmory, Tyranitar, Mega Tyranitar, Pelipper, Lopunny, Magnezone, Tangrowth, Mamoswine, Victini, Excadrill, Amoongus, Ferrothorn, Bisharp, Volcarona, Tornadus-Therian, Landorus-Therian, Black Kyurem, Keldeo

Kalos: 27 in OU (1/17)
Mega Venusaur, Mega Charizard X, Mega Alakazam, Mega Pinsir, Mega Gyarados, Zapdos, Mega Scizor, Skarmory, Tyranitar, Mega Tyranitar, Pelipper, Mega Sableye, Mega Mawile, Mega Medicham, Garchomp, Magnezone, Mamoswine, Rotom, Amoongus, Ferrothorn, Bisharp, Greninja, Ash-Greninja, Hawlucha, Zygarde, Mega Diancie, Hoopa Unbound

Alola: 29 in OU (1/14)
Clefable, Mega Alakazam, Chansey, Mega Pinsir, Mega Gyarados, Mega Scizor, Skarmory, Tyranitar, Mega Tyranitar, Pelipper, Mega Sableye, Mega Mawile, Mega Lopunny, Garchomp, Magnezone, Bisharp, Volcarona, Hawlucha, Zygarde, Toxapex, Mimikyu, Tapu Koko, Tapu Lele, Tapu Bulu, Tapu Fini, Celesteela, Kartana, Magearna, Blacephalon

Kanto: 5 in Ubers (1/30)
Mega Gengar, Mega Kangaskhan, Mewtwo, Mega Mewtwo X, Mega Mewtwo Y

Johto: 7 in Ubers (1/36)
Mega Gengar, Mega Kangaskhan, Mewtwo, Mega Mewtwo X, Mega Mewtwo Y, Lugia, Ho-Oh

Hoenn: 13 in Ubers (1/15)
Blaziken, Mega Blaziken, Mega Metagross, Mega Salamence, Kyogre, Primal Kyogre, Groudon, Primal Groudon, Rayquaza, Deoxys, Deoxys Attack/Speed/Defense

Sinnoh: 6 in Ubers (1/35)
Mega Gengar, Mega Lucario, Dialga, Palkia, Giratina, Giratina-Origin

Unova: 7 in Ubers (1/43)
Mega Metagross, Mega Lucario, Reshiram, Zekrom, Landorus, White Kyurem, Genesect

Kalos: 11 in Ubers (1/41)
Mega Gengar, Mega Kangaskhan, Mewtwo, Mega Mewtwo X, Mega Mewtwo Y, Mega Salamence, Mega Lucario, Aegislash, Xerneas, Yveltal, Complete Zygarde

Alola: 14 in Ubers (1/29)
Mega Gengar, Mega Kangaskhan, Mega Salamence, Mega Metagross, Mega Lucario, Complete Zygarde, Solgaleo, Lunala, Pheromosa, Necrozma Dusk Mane, Necrozma Dawn Wings, Ultra Necrozma, Marshadow, Naganadel

source: Bulbapedia's "List of Pokemon by (region) Pokedex number" pages

The regions with the most OU Pokemon is Alola by both count and fraction.
The regions with the most Ubers Pokemon are Alola (by count) and Hoenn (by fraction).

Comments

I like your answer and Carnapper's answer a lot, but I guess I'll keep his answer as best since I selected it first and he has less points. I was hoping you'd answer this though because you're good at this stuff.