Why can't I catch mightyena in Pokemon Y?

Question

it says area unknown in my game, but on this site it says you can get it on route 15 in X and Y

Comments

This site's information on the new games is often inaccurate, and they're slow on updating everything. At this point, Serebii.net is a far more reliable source of information. Mostly because this site's information is for the most part based on this Q&A section, and often has answers that are either slightly off, or downright wrong.

Answer 1

Only Pokemon X has Mightyena. Using the correct Friend Safari, Mightyena can be found in Y.

Source

Comments

I still don't get it! Can you explain it better please!

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Mightyena = Pokemon X exclusive = Not available in Pokemon Y