Some maps of this game by VGCartography are viewable on VGMaps (link) & their DeviantArt (link). They're labeled with most of the treasures, enemies (and their HP), and more! They might be useful for learning the game or routing it.

• Ocean Tower / First Dungeon (damage chart given is incorrect; use this)
• Cardon Forest & South Cardon
• Underground Ruins (damage chart given is incorrect; use this)
• Apple Market, Downtown, & Old City
• City Hall
• Yass Plains & Clozer Woods
• Uptown (missing a few small Zenny rewards in boxes/chests, & the Vacuum Arm part next to the hospital)
• Cardon Forest Sub-Gate
• Lake Jyun Boat Autoscroller
• Lake Jyun Sub-Gate
• Clozer Woods Sub-Gate (the floor textures shown are inaccurate)
• Main Gate

Some maps are viewable on Mega Man Legends Station (link) as well, which use the in-game maps instead. They only really cover dungeons, however.

• Ocean Tower / First Dungeon
• Underground Ruins
• Cardon Forest Sub-Gate
• Lake Jyun Sub-Gate
• Clozer Woods Sub-Gate
• Main Gate