Question

About how many levels does it take to max out evs

Answer 1

There is no set level.
You can max out EVs at almost any level.
For Example, I maxed out my Ferroseed's HP EVs at Level 2.
You can use Power Items to make the EV training process quicker.

Comments

Thanks for the answer

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I maxed all Evs on a Bagon at level 9 :D