What Pokemon are always shiny in-game?

Question

I do not mean a Pokemon, for example, Beedrill always being shiny no matter how you get it, I mean a special encounter Pokemon that is always shiny, such as the Gyarados in HG/SS. Are there any other Pokemon like this and if so, what are they?

Answer 1

To my knowledge, there are only two Pokémon that are both interactable and Shiny 100% of the time.

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The most obvious one is the Red Gyarados encountered at the Lake of Rage in both the second and fourth generation games.

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While not as well known as the Red Gyarados, there is a Shiny Haxorus awaiting the player at the center of the Nature Preserve in BW2.

Comments

Thanks!

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There is one other occurrence of obtaining a definite shiny Pokémon :
Defeat Alder's Grandson, Benga, in the Black Tower in Black 2 or in White Treehollow in White 2.
His Pokémon are level 80, if you beat him, he will give you a Shiny Gible in Black 2 or a Shiny Dratini in White 2
Source: Bulbapedia

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in the question it says encounter, not gift

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Oops......