If I catch a shiny marked starter in gen 9, then transfer it to gen 8, is that Pokemon legal?

Question

Obviously in SWSH it's impossible to obtain marked starters because they aren't encounterable in the wild. I want to know if the hack checks have been updated to allow these new marked starter Pokemon.

Comments

Pretty sure it’ll be fine. I don’t think they ever had a check for marks

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It’s ok if use a non shiny starter to test this right?

Update: after spending 2 hours to get the coastal  biome upgrade and another hour and a half to get a marked grooky I’ve finally got everything I need to test this. I’ll test this later once I have internet.

Answer 1

The other answer lacked any kind of source so I decided to test this myself. To test this I got a grookey from the coastal biome with the uncommon mark. Then I sent it to Pokemon shield and traded it to a friend. The game let me trade it just fine meaning it passed the hack checks. So yes a shiny marked starter from gen 9 is legal in sword/shield

Answer 2

Yes its fine as long as the Pokemon is not a brand new Pokemon and is compatible with the game you are transferring it to

Comments

proof?