Pokémon Quest was first announced and released on Nintendo Switch at the end of May. To celebrate its release on mobile devices, players will have the ability to purchase a "Mini Expedition Pack" which gives you a special Pikachu knowing the move Surf, 100 PM Tickets and a statue item modelled after a surfing Pikachu. This is only available for the first 72 hours of your game though, so make sure you don't miss out!
It's also worth noting that you cannot transfer save data between the Switch and Mobile app, so the two will always be separate saves. Will you be double dipping and downloading the game on mobile or starting your adventures for the first time in Pokémon Quest?