The IV checker in Pokemon X and Y is located in the Kiloude City Pokecenter, the girl to the far left.

Other guides:

Pokedex:

• Pokemon X & Y Kalos Pokedex Guide
• Exlusive Pokemon in X and Y
• Complete X & Y National Pokedex

Guides & Locations:

• X & Y Pokemon Locations by Route
• Pokemon X and Y Megastone Locations
• Pokemon X & Y Type Matchups
• Pokemon X & Y O-Power Locations & List
• Pokemon X & Y Kalos Pokemart Guide
• Pokemon X & Y Roller Skates Tricks List
• List of Pokemon Not in the Kalos Pokedex
• Pokemon That Evolve When Traded Holding an Item
• How to Get Into the Lumiose Boutique
• Pokemon X and Y IV Checker Location

Maps:

• Pokemon X and Y Lumiose City Map

End Game Guides:

• Pokemon X and Y Post Game Content List

Useful Pokemon X and Y Tools & Links:

• Pokemon X and Y Interactive Map