Question

Which gen introduced the most OU Pokemon?

Comments

When you say "brought" do you mean which generation has the most OU pokemon, or which generation caused the most pokemon to move up/down to OU?

---

Which generation has the most

---

1,2 and 5 bring the same.

Answer 1

Gen 5 introduced the most OU Pokemon to date so far.

Here's the list of counts:

Gen I : 9
Gen II : 9
Gen III : 7
Gen IV : 5
Gen V : 11
Gen VI : 4

Hope I helped!

Answer 2

Gen 1,2 and 5 brought out 14 each. I have not considered Megas, as they're not a different Pokemon, but more of a power up/upgrade for a duration of 1 battle.
List of all OU
Hope I helped

Comments

You know your source is for Gen VI right and is outdated.