Nincada can be deposited into different games depending on the game it was originally in.
<Pokémon Sword & Shield>
Nincada caught in Pokémon Sword & Shield can only be deposited into these games.
<Pokémon Brilliant Diamond & Shining Pearl>
Nincada caught in Pokémon Brilliant Diamond & Shining Pearl can only be deposited into these games.
<Moved from Pokémon Bank or transferred from Pokémon GO>
Nincada moved from Pokémon Bank or transferred from Pokémon GO can only be deposited in Pokémon Sword & Shield.