PokéBase - Pokémon Q&A
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Generation V
-Hidden Grottos
-Dream World
-Pokemon Dream Radar
-Zen Mode Darmanitan available in-game in BW (outside Relic Castle)

Generation VI
-Hoard encounters
-Friend Safari

Sometimes events will also give out Pokemon with their hidden abilities, like the Speed Boost Torchic available right now.

Bulbapedia - Ability

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