This is a hack for the Japanese version of Rockman 4, you need to patch the original Rockman 4, not Mega man 4! This hack changes the content:
-Enemy AI
-Boss AI
This is a small hack, you can think of it as New Game+ for Rockman 4 :)
Database match: Rockman 4 - Aratanaru Yabou!! (Japan)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: C33C6FA5B0A5B010AF6B38CBD22252A595500A5A
File CRC32: 771A9138
ROM SHA-1: 83F5EA60D6E6489EC0E5AF4B938D2D1C8FD24DD5
ROM CRC32: F161A5D8