Mega Man Legends 2 (called Rock Man Dash 2 in Japan) was released in japan in April of 2000, and has helped establish the series. Here are the beta findings that have been made, consisting of pre Japanese release pictures, and even some footage of a town that was removed from the final version of the game.
The most notable feature of the above video, is at 1:08, where the footage of the removed town can be seen.
And in the gallery below, you can see concept arts for unused characters / enemies (taken from the Rockman Dash 2 art book), a character that’s not where they’re supposed to be, more of the unused town, a beta timer and more. Also of note, is the Blue/Purple haired character. In one image, they’re in an area that they’re not supposed to be, and in another, they can be seen in the removed town!
A Rockman DASH 2: Episode 1 beta demo that was included in “Tron ni Kobun”, the Japanese version of Misadventures of Tron Bonne.
A video from Mega Man Legends 2’s debug room can be found in Undergroundruin’s Youtube Channel!
Thanks to OKei for the contribution!