In the real world,is it possible for a regular Joe to develop the same intelligence level as the DC fictional character BATMAN?
No, this question would be very much off-topic for skeptics. For further information on what is on-topic see the helpcenter.
First off, the question would be out of scope for Skeptics.SE specifically (no notable claim to be examined - NOBODY makes a claim "it is possible for a regular Joe to develop the same intelligence level as the DC fictional character BATMAN", that I'm aware of).
Second of all, even if it was on-topic on some specific SE site (possibly Cognitive Science, or, if you can find an example of someone making this claim notable, here), it'd still be a poor fit and likely to be closed on SE network, because it's too vague to be answerable.
How do you define "intelligence level" in objective way? IQ? Something else? Your question doesn't specify.
Nobody knows Batman's intelligence level as a character, including IQ. The comics state he's intelligent but don't quantify it (as far as I know)
What does "regular Joe" mean? That has no definite meaning.
A question that MAY likely to be answerable (whether it's in scope for CogSci or another SE site, I'm not sure) would be:
Is it possible for a person to develop from IQ of 100 to IQ of 160?
What are the approaches proven to be effective at raising your IQ level? How much can they raise IQ?