How is there Weavile in "Lucario and the Mystery of Mew"?

Question

Becuase weavile was introduced in gen IV

Answer 1

And so was Lucario. Munchlax, Mime Jr, and Bonsly are some others released before the actual game.

Comments

They like to show some of the new pokemon to reel in more fans for the next generation of pokemon...

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They didnt do it this generation :(

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Zoroark and Zorua