Question

Where can you check your Pokemon's happiness in X/Y?

Answer 1

In X & Y, it's given by a girl in Laverre City.

Source: Serebii page on happiness

She is in the Pokemon Fan Club, which is in the north-westernmost house.

Comments

Thanks for quick response lol. The link was very useful as well.

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Lol you're welcome

Answer 2

Talk to the woman in the Pokemon Fan Club in Laverre City.