Pachirisu, Lucario, Rhyperior, Electivire and Glaceon Pokémon Statues are now available for players Secret Bases in Pokémon Brilliant Diamond and Shining Pearl by using the Mystery Gift code:
MERRYCHR1STMAS.
Spruce up your Secret Base for the holidays with some Pokémon Statues! Enter code MERRYCHR1STMAS in #PokemonBrilliantDiamond and #PokemonShiningPearl to receive some new décor for the next time you visit the Grand Underground!
Source:
https://twitter.com/playpokemon/status/1472265407511760900M