I grew and plucked a white chocolate pikmin. It is visible in my current squad and walking with me but it does not show up in my decor index. It is still a shadow and can’t be sent to a mushroom battle.
*Edit: I have grown 3 chocolate pikmin(blue, white & ice) in total now and the only one that is show up as registered is my ice chocolate. Therefore it is the only one I’m able to use for any battles. I have signed out of the game and signed back in. I’ve closed the game and restarted it multiple times, and I’ve restarted my phone(iPhone). My game is updated as is my phone.