What was the first Pokémon revealed for each gen?

Question

E.G. Zoroark or Zorua for gen 5.

Answer 1

Generation 1
- Rhydon

Generation 2
- Ho-oh

Generation 3
- Kecleon

Generation 4
- Munchlax

Generation 5
- Zoroark
- Zorua

Generation 6
- Chespin
- Froakie
- Fennekin
- Xerneas
- Yveltal

Generation 7
- Magearna

Generation 8
- Grookey
- Scorbunny
- Sobble

Source (aside from the previous answer)

Hope this helped!

Answer 2

Generation 1
- Rhydon

Generation 2
- Ho-oh

Generation 3
- Keckleon

Generation 4
- Munchlax

Generation 5
- Zoroark
- Zorua

Generation 6
- Chespin
- Froakie
- Fennekin
- Xerneas
- Yveltal

Comments

merci Jojo

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de rien Jojo

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decor Jojo

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Assuming any of Gen 6's PKMN weren't previously hinted at...
http://bulbapedia.bulbagarden.net/wiki/Prototype_Pok%C3%A9mon_and_characters

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Random fact for Gen 6 (this only applies to the anime)

Apparently, the Decolore Islands were part of the Best Wishes Series (gen 5 anime).
This episode was released in Japan on the 18th of July, 2013.During the gang's visit to the Decolore Islands, they cross paths with a lady name Alexa (the journalist). This lady is accompanied by her own Helioptile and Gogoat which even Ash's Pokédex fails to recognise!
https://bulbapedia.bulbagarden.net/wiki/BW134