PokéBase - Pokémon Q&A
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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.

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Best answer

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!

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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

You know your source is for Gen VI right and is outdated.