PokéBase - Pokémon Q&A
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I just noticed that Houndour/oom and Aron/Lairon/Aggron are exclusive to X, but the stones are in Y. What's up with that?

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Only GameFreak can give is the exact answer to this question but it's most likelely to promote trading and encourage people to buy both the games.

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Go figure.
Ya need em for ya pokeydex 2 brah.