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Based on Japanese press materials, Legends has an active time battle system, climbing, gliding, and boss battles. You can sneak up on Pokémon to catch them without going into battle. If you get attacked the trainer itself can get hurt, forcing you to flee. Pokémon sizes are apparently scaled properly now.
There is no multiplayer.
The DP remakes have the Shaymin NPC from platinum in the trailer, so I guess that event is still in. Porygon Z was also in the trailer, so it’s probably using the platinum dex.