Sorry I know this is an old post but for Pokemon and Splatoon, it's based off of the user's account/profile. So if you brought over your user data to another switch, you'd still have your data for those games. Except ACNH because it's based off the actual console
Actually no. The save data is owned by the Island Representative. This was confirmed by Tom Nook thanks to a video by KhalidPrecious
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