What dual type Pokemon have one of their types swapped out for another one upon mega and regular evolution?

Question

E.g scorupi and drapion
Gyatados and mega gyarados

Comments

Would this include Pokemon like Sceptile who gains a new type upon mega evolution, Bellossom who loses a type, Eevee who has a new type altogether, and Togekiss who had it's type changed from gen 5 to 6?

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Swap not gain or lose

Answer 1

Onix replaces Rock with Steel when it evolves into Steelix.

Scyther replaces Flying with Steel when it evolves into Scizor.

Pupitar replaces Ground with Dark when it evolves into Tyranitar.

Kirlia replaces Fairy with Fighting when it evolves into Gallade.

Azurill replaces Normal with Water when it evolves into Marill.

Surskit replaces Water with Flying when it evolves into Masquerain.

Nincada replaces Ground with Flying when it evolves into Ninjask.

Nincada doesn't technically evolve into Shedinja, but it replaces Ground with Ghost when Shedinja comes into existence.

Swablu replaces Normal with Dragon when it evolves into Altaria.

Skorupi replaces Bug with Dark when it evolves into Drapion.

Fletchling replaces Normal with Fire when it evolves into Fletchinder.

Skrelp replaces Water with Dragon when it evolves into Dragalge.

Dartrix replaces Flying with Ghost when it evolves into Decidueye.

Exeggcute replaces Psychic with Dragon when it evolves into Alolan Exeggutor.

Mime Jr. replaces Fairy with Ice when it evolves into Galarian Mr. Mime.

Charizard replaces Flying with Dragon when it evolves into Mega Charizard X.

Gyarados replaces Flying with Dark when it evolves into Mega Gyarados.

Altaria replaces Flying with Fairy when it evolves into Mega Altaria.

Hisuian Sneasel switches around from Poison-Fighting to Fighting-Poison.

Scyther replaces Flying with Rock when evolving into Kleavor.

Hope I helped!

Comments

Forgot shedinja which replaces ground with ghost

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Did you mean fairy with fighting for Kirlia to Gallade and Flying with Fairy for Altaria to Mega Altaria?

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Nincada doesn't technically evolve into Shedinja, but I can add it if you want.

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Edited. Thanks, piano!

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Oof Sniped.

Answer 2

In order of my source
https://pokemondb.net/evolution
https://bulbapedia.bulbagarden.net/wiki/Mega_Evolution

When Charizard mega evolves into Mega Charizard X it loses the Flying type for the Dragon Type
When Onix evolves into Steelix it loses the Rock type for the Steel Type
When Exeggcute evolves into Alolan Exeggutor it loses the Psycic type for the Dragon Type
When Mime Jr. evolves into Galarian Mr. Mime it loses the Fairy type for the Ice Type
When Scyther evolves into Scizor it loses the Bug type for the Steel Type
When Gyarados mega evolves it loses the Flying type for the Dark Type
When Azurill evolves into Marill it loses the Normal type for the Water Type
When Pupitar evolves into Tyranitar it loses the Ground type for the Dark Type
When Kirlia evolves into Gallade it loses the Fairy type for the Fighting Type
When Surskit evolves into Masquerain it loses the Water type for the Flying Type
When Nincada evolves into Ninjask it loses the Ground type for the Flying Type
When Nincada evolves into Shedinja it loses the Ground type for the Ghost Type
When Swablu evolves into Altaria it loses the Normal type for the Dragon Type
When Altaria mega evolves it loses the Flying type for the Fairy Type
When Skourpi evolves into Drapion it loses the Bug type for the Dark Type
When Fletchling evolves into Fletchinder it loses the Normal type for the Fire Type
When Skrelp evolves into Dragalge it loses the Water type for the Dragon Type
When Dartrix evolves into Decidueye it loses the Flying type for the Ghost Type

Comments

Oops, forgot about about Alolan Exeggutor.