Pokemon TCG: Galar Partners Tins - Rules of Play says:
Each of these fantastic tins contains a full-powered and entirely awesome Pokémon V, fully evolved from a first partner Pokémon of the Galar region! You'll also get a selection of Pokémon TCG booster packs to add even more Pokémon to your team. Get your Pokémon V collection started off right with the Pokémon TCG: Galar Partners Tin! Customers will receive one at random unless specified.