A girl asks me
The Riches are not seen in X and Y.
Rather, they are in the Unova Region in Undella Town, waiting to battle you in Black and White. But they don't appear in Gen VI, don't worry. :3
Hope I helped. :)
Do you mean the riches as in the ones introduced in Gen 5 as a family and gave you a lot of money from battling them?
If so. They don't appear in Pokémon X/Y, only B/W.