Which Pokemon had their ability switched ?

Question

Lots of Pokemon have switched their abilities over the past gens but as I am too lazy to search for them all can you guys tell me. Oh and maybe why they were switched (just curious)

Note: I don't mean abilities that change your ability I mean the Pokemon that had diferent abilities before gamefreak changed them

Comments

Beartic
Gained: Slush Rush (Speed Boost in Hail)
Boldore and Roggenrola
Gained: Weak Armor (Lowers Defense, but raises Speed two stages when hit with a Physical attack)
Entei
Changed: Flash Fire -> Inner Focus (Can't be flinched)
Gengar
Changed: Levitate -> Cursed Body (May disable the enemy's move when hit with a move that makes contact)
Gigalith
Gained: Sand Stream (Starts a Sandstorm)
Pelipper
Gained: Drizzle (Starts Raining)
Raikou
Changed: Volt Absorb -> Inner Focus (Can't be flinched)
Suicune
Changed: Water Absorb -> Inner Focus (Can't be flinched)
Torkoal
Gained: Drought (Starts Intense Sunlight)
Vanilluxe
Gained: Snow Warning (Starts a Hailstorm)
Chandelure
changed: ->Shadow Tag to Infiltrator (passes through walls like safeguard and reflect)

these are the ones I know.
source : 6 mins of my life in which I searched google and my experience

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I'm too lazy to search and answer as well but you repeated Gengar and missed Chandelure, whose hidden ability was changed from Shadow Tag to Infiltrator

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thanks! edited it.

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You missed Pidgey, which gained tangled feet in gen 4.

Answer 1

First, this answer does not count the hidden abilities that Pokemon gained in gen 5, because there are a lot of them.

Pokemon that gained a second ability from gen 3 to gen 4
Tangled Feet: Pidgey family, Spinda
Rivalry: NidoranF family, NidoranM family
Magic Guard: Clefairy family
Dry Skin: Paras family
Tinted Lens: Venonat family, Illumise
Technician: Meowth family, Scyther family, Hitmontop, Smeargle
Anger Point: Mankey family, Tauros
No Guard: Machop family
Hydration: Seel family
Skill Link: Shellder family
Forewarn: Drowzee family, Jynx family
Steadfast: Tyrogue
Reckless: Hitmonlee
Iron Fist: Hitmonchan
Leaf Guard: Tangela, Hoppip family
Scrappy: Kangaskhan, Miltank
Sniper: Horsea family, Remoraid family
Filter: Mr. Mime
Mold Breaker: Pinsir
Adaptability: Eevee
Download: Porygon, Porygon2
Solar Power: Sunkern family, Tropius
Super Luck: Murkrow, Absol
Quick Feet: Granbull, Teddiursa family, Poochyena family
Gluttony: Shuckle, Zigzagoon family
Snow Cloak: Swinub, Piloswine
Frisk: Stantler, Shuppet family
Poison Heal: Shroomish family
Normalize: Skitty family
Stall: Sableye
Simple: Numel
Solid Rock: Camerupt
Anticipation: Barboach family
Ice Body: Snorunt family, Spheal family

BW to BW2 or gen 6
Blue Basculin: Reckless (except the one from the in-game trade, which has rock head) -> Rock Head (except ones hatched from eggs in BW2, which can have reckless) (all reckless blue Basculins get rock head when transferred to gen 6)

Gen 5 to gen 6
Gained Competitive: Jigglypuff family, Milotic, Gothita family
Gained Lightning Rod: Plusle
Gained Volt Absorb: Minun
Gained Oblivious: Feebas
Gained Protean: Kecleon
Gained Frisk: Duskull family
Gained Reckless: Starly
Gained Anticipation: Ferrothorn
Zapdos: lightning rod -> static
Venipede family: quick feed -> speed boost
Litwick family: shadow tag -> infiltrator

Gen 6 to gen 7
Gained Hydration: Wingull
Gained Drizzle: Pelipper
Gained Drought: Torkoal
Gained Weak Armor: Roggenrola, Boldore
Gained Sand Stream: Gigalith
Gained Snow Cloak: Vanillite, Vanillish
Gained Snow Warning: Vanilluxe
Gained Slush Rush: Cubchoo family
Gengar: levitate -> cursed body
Raikou: volt absorb -> inner focus
Entei: flash fire -> inner focus
Suicune: water absorb -> inner focus

Gen 7 to gen 8
Gained Stench: Koffing family
Gained Neutralizing Gas: Koffing family
source