The "Brilliant Diamond" and "Shining Pearl" updates mostly showed off new graphics, with the game sporting a combination of chibi-styled characters for the overworld map and more fleshed out models akin to the "Sword" and "Shield" designs for battles. The showcase also revealed that beloved features such as the Pokémon Underground and Pokémon Contests would be returning. Pokémon Underground is a mining area players can access at any moment outside in the overworld map, where players can mine for items, find particular Pokémon and build their own underground base. These modes have additional perks as well, like a new method to capturing Pokémon by placing certain statues in your underground bases.

From the short clips in the trailer and the Pokémon Presents live stream Feb. 26, we can see that the mechanic for capturing Pokémon is similar to that of the "Let's Go, Pikachu" and "Let's Go, Eevee" series. Wild Pokémon roam the open world. Instead of tiring out Pokémon through the tried-and-true battle system, players simply toss a Pokéball, aiming to clear certain precision and timing benchmarks. Moreover, catching Pokémon is now seamlessly integrated into the open world, a first for the series. The battle system -- which looks relatively unchanged from the mainline games -- appears to be returning, alongside some new features, like rolling and sneaking through tall grass to get the jump on unsuspecting Pokémon.