Try installing savegames of Let's Go Pikachu and Let's Go Eevee.
I've played Let's Go Eevee, so I got my Eevee in Sword.

 

Wait until tomorrow when PKHex is updated for Sword/Shield.

 

Just inject completed saved for LGPE and then you can go pick them both

 

i caught my pikachu in pokemon sword and was able to dinamax it

 

— Posts automatically merged - Please don't double post! —

its probally in the same area i caught my pikachu you will see kids wearing a pikachu and evee costume in yellow grass dont remember the name of the area

 

i didnt get anything from them and i have lets go pikachu and lets go evee

 

Any save should do (I never beat let's go)
talk to those npcs and make sure you're playing under the same account you played let's go under if you have multiple accounts.

all Pikachu and Eevee in game can dynamax, but only the ones obtained from these npcs can gigantamax (and get the new forms & attacks)

The npcs are encountered at the wild area train station the first time you go there (and they stay there forever) they have flawless IVs and don't worry about losing the gigantamax forms if they accidentally evolve, since they are hard coded to never evolve

 

guys. i did something stupid and I released the gigantamax pikachu version, thinking i could also do the same with the wild pikachu that i caught, so no need to have double pikachu.

is there a possibility to get the gigantamax pikachu back again? maybe using PkHex? thanks

 

Code to claim rewards from playing lets go pikachu/eevee and pokemon quest (unknown reward, but posting for anyone that does know).
Active the cheats before the save file its loaded (during game boot) then go to the guys in the train station and talk to them

Code:

[Redeem Pokemon Let's Go Pikachu]
04000000 00C37E3C 6B1F011F

[Redeem Pokemon Let's Go Eevee]
04000000 00C37E98 6B1F011F

[Redeem Pokemon Quest ???]
04000000 00C37EF4 6B1F011F

 

Yes