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I think only StreePass counts, according to Serebii. You can check how many Pokemiles you have on the Global Link if you synced your game, or by talking to a man in the Pokemon Center in Lumiose City on South Boulevard.
Hey there, I answered your question on the Q&A thread, just letting you know in case you miss it :)
Pokemiles aren't based on steps; Pokemiles are earned by trading with friends, passersby, on the GTS or Wonder Trade. You can then exchange your Pokemiles for items.