Following the announcement of Pokémon Legends: Arceus during February’s Pokémon Presents, which is scheduled for release in early 2022, not many details have been offered about the Nintendo Switch title beyond what was shown during its teaser trailer.
While the information provided by The Pokémon Company has been very sparse, the community has been trying to dig out every detail and come up with theories and hypotheses regarding, for example, the story and plot of the new title.
As a result, an interesting and crazy theory has been put forward about time travel, which would be very much present in Pokémon Legends: Arceus. According to some fans on social media, Helio, the leader of Team Galaxy in Pokémon Diamond and Pearl, would travel in the Pearl edition to Pokémon Masters EX (through space), the mobile game in which he appears to teleport with Palkia and say “Where am I?
Given that in Pokémon Masters EX, Helio is seen with Palkia, many have imagined that in Pokémon Diamond Edition, Helio may have time-traveled with Dialga to the world of Pokémon Legends: Arceus and that this would be the reason for seeing so much symbolism that references that of Team Galaxy in ancient Sinnoh. This was expressed by one user on Twitter
So, if Pokémon Masters is where Helio ended up when it travelled through space in Pearl.
I imagine where Helio ended up when he travelled through time in Diaman-