The firm compared the first 72 hours of engagement with similar timeframes for each of the series' recent launches, finding that Arceus "significantly outpaced" the debuts of Pokémon Sword & Shield, Pokémon Let's Go Pikachu & Eevee!, and Pokémon Brilliant Diamond & Shining Pearl.
In fact, Gamesight states that peak viewership for Arceus was almost twice the peak viewership of Brilliant Diamond & Shining Pearl, which was the previous record-holder for the series. However, despite posting improved numbers over its forerunner, Arceus was only the top hit on Twitch for its launch day.
Here's some more insight:
The astonishing thing is that even though its viewership data is better across the board compared to earlier Pokémon games, it only peaked as the #1 watched game on Twitch during its launch day. This goes to show just how many people watch streaming platforms now. It's difficult for even a new, ultra hyped release, such as Pokémon Legends: Arceus, to retain the top spot for an extended period of time.
Arceus was able to retain an ACV (average concurrent viewer) count of 200,000+ for nearly all of Friday and Saturday. It also had 20k more total streams and 100k more hours streamed than Brilliant Diamond/Shining Pearl. This shows that it's not just larger streamers carrying the numbers, but Twitch as a whole.