The episode of MegaMan NT Warrior Axess, "SpoutMan's New Hero!" is not seen. It only aired once on TeleToon in Canada. It was supposed to air on Kids' WB! in the USA on September10, 2005, but was pre-empted for "BubbleMan's Plan".
The Japanese title is "Aquaman In Love".
EDIT: In March 2023, Capcom USA started streaming the entire English dubbed series of MegaMan NT Warrior, including Axess, to promote the then-upcoming re-release of the MegaMan Battle Network Legacy Collection for Nintendo Switch, including the lost episode. This episode was available to view from March 23, 2023 to September 20, 2023.
https://www.youtube.com/watch?v=lFazrboTtBw
EDIT: On January 2, 2024, MattysMasquerades (aka yours truly) uploaded the episode to DailyMotion - https://www.dailymotion.com/video/x8r3uh2