Will your Rival/Friend's captured shiny Pokemon remain shiny forever during battles?

Question

Like when I asked in the ''Is it possible for your capture teacher's Pokemon to be shiny?'', the answer was YES THEY CAN.

Now for example - In Pokemon Emerald, your rival/friend's name is Wally and after you teach him how capture Pokemon using the Pokeballs, he captures a Ralts being his first Pokemon (I think it was the first) and it will remain in the team during the progress of the history, evolving it into Gardevoir.

Now the question - Will Wally's Ralts/Kirlia/Gardevoir will be forever a shiny? Or are they programmed to go back to normal sprite?

Answer 1

Wally

No.

>It is also possible for Wally to catch a Shiny Ralts in the tutorial. However, it will not stay Shiny in subsequent battles.

Source

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Other Rival's/NPC's

NPC's (Non-Player Characters) are programmed not to have Shiny Pokémon so again the answer is no.

This is the same case as if there was a Shiny Starter Pokémon at the beginning of the game and you picked the Starter that's type was weak to that of the Shiny Starter Pokémon, resulting in your Rival choosing the Shiny Starter Pokémon. When your Rival challenges you to a battle he/she will send out an Ordinary Pokémon.

So for example if there was a Shiny Bulbasaur and you choose Squirtle instead, causing your Rival to choose the Shiny Bulbasaur, when he challenges you to a battle he will send out an Ordinary Bulbasaur despite the Bulbasaur he just choose being Shiny.

Sources: 1 | 2

Answer 2

As of such - Yes

The captured Pokemon will be pretty much the same throughout the story line. It will carry the same nature, the same IVs and the same hidden values, Since these hidden values are what determine the shininess of a Pokemon, yes if Wally caught a Pokemon that was shiny (Ralts) then it will stay shiny throughout the game.

Hope I helped!

Comments

I thought it was impossible for a rival to get a shiny. Or does that only apply when it first appeared as an already caught pokemon.

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Well, since you have to actually find him a pokemon and have him catch it, there is a possibility

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No; if Wally catches a shiny Ralts, it'll not remain shiny throughout the game.
The game treats his first encounter with Ralts as a wild one, but on his team, his Gardevoir is essentially a set NPC.

"t is also possible for Wally to catch a Shiny Ralts in the tutorial. However, it will not stay Shiny in subsequent battles."
Source: http://bulbapedia.bulbagarden.net/wiki/Wally_(game)

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so shiny ralts cannot be shiny during the history, making it back to normal sprite?