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Reason: Double-check all Gen VI—and maybe Gen V—events for HA Pokémon not mentioned below (Pikachu for instance definitely has some HA events scattered around). Also check Gen VII events.
This is a list of Pokémon that have been released with their Hidden Ability, and how they may be obtained.
So far, the only Pokémon with unique Hidden Abilities that it is still impossible to obtain are the Legendary beasts (Raikou, Entei, Suicune), Heatran, the generation VII starters (Rowlet, Dartrix, Decidueye, Litten, Torracat, Incineroar, Popplio, Brionne, Primarina), Oranguru, Passimian, and the Guardian deities (Tapu Koko, Tapu Lele, Tapu Bulu, Tapu Fini). For every other Pokémon, at least one member of its evolutionary family has been released with its Hidden Ability. Some Pokémon with forms cannot have their Hidden Ability for all of their forms, however; these include the Flabébé and Pumpkaboo families, whose forms are inherited through breeding, and Vivillon, whose Poké Ball and Fancy Patterns cannot be obtained in-game and have never been released with Vivillon's Hidden Ability.
Of the Pokémon with released Hidden Abilities, only 53 Pokémon (in 30 families, mostly made up of Fossil Pokémon, starter Pokémon, and Legendary Pokémon) cannot be obtained within Generation VI alone and must be transferred via Poké Transporter from Generation V. Of the remaining Pokémon that do not have a unique Hidden Ability (74 Pokémon in 55 families, approximately half of which are Legendary Pokémon and most of the rest having Levitate), some can be caught via methods where they theoretically could have their Hidden Ability slot, but it is impossible to tell.