X event cannot be traded online

[theSLAYER]

This is a frequent occurrence. Has nothing to do with us.

Assuming you (the user) did not mess up the injection process, did not give it illegal moves etc,
this is thoroughly Nintendo's server's allowlist issue.

Whenever a new event drops, sometimes they do not add the event to the allowlist. This is not new.

Their list typically affects other online usage, like trying to use it for a raid. Not just trading.

FAQ:
Q) When do you think they'll update to allow x event
A) Who knows, we can't see the future

Q) Why does my mon trade locally, but not online
A) Local trades do not go through the allowlist.

Q) Can I ask about this
A) Asking about this won't make the process go any faster (and it's not like we have any control over their allowlist). Just wait patiently.

[rbz2005]

Updated 11/6/2020 

KOR Mewtwo event 2020 is now whitelisted.

Nobunaga's Black Rayquaza 1.0.0 is not tradable in Sword/Shield. 

PCNY Pikachu with Trainer ID 000001 is not tradable in Sword/Shield. 

Zap Cannon Squirtle is not tradable in Sword/Shield. 

Edited November 7, 2020 by rbz2005
Updating new mons that are not whitelisted .

[Atrius97]

This isn't a new issue either. Several past events were/are subject to this as well. 

Shiny Solgaleo and Lunala, (and several other HOME exclusives), were unable to trade in SWSH when HOME was first released, they were added to the trade whitelist at a later date. 

Shiny Jirachi from Channel/Colo Bonus Disc in Gen 3 were also barred from transfer until the first Tanabata Shiny Jirachi event, years later.

Some events are still barred from transfer in other generations, such as the Odd Egg Pokémon from Virtual Console Crystal.

(Odd Egg Pokémon must have the event move "Dizzy Punch" removed from them to be allowed past the whitelist, Nintendo has completely forgotten about that event to this day.)

Edited October 2, 2020 by Atrius97

[theSLAYER]

1 minute ago, Atrius97 said:

This isn't a new issue either. Several past events were/are subject to this as well. 

Shiny Solgaleo and Lunala were unable to trade in SWSH when HOME was first released, and were added to the whitelist later on.

Some events are still barred from transfer in other generations, such as the Odd Egg Pokémon from Virtual Console Crystal.

(These Pokémon must have the event move "Dizzy Punch" removed from them to be allowed past the whitelist)

Plus Transporter's whitelist and SWSH whitelist probably isn't the same too.

[Atrius97]

4 minutes ago, theSLAYER said:

Plus Transporter's whitelist and SWSH whitelist probably isn't the same too.

Yup, their legality checks and "transfer/trade" whitelisting system have never been consistent, regardless of which generation of games you're looking at.

It's surprising we haven't found more issues with it, considering the sheer number of encounters/events they have to keep track of, going back nearly 2 decades.

Edited October 2, 2020 by Atrius97

[Urt1]

That's probably why development starts around the same time as a earlier project about to release. i.e ORAS during XY. Streamlines the thing a bit more.