This is a bug fix patch made by Puresabe for Rockman 5, although it seems to work in Megaman 5 USA roms too. It allows Megabuster charge to progress even while sliding.
Database match: Rockman 5 - Blues no Wana! (Japan)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
File SHA-1: 0FC06CE52BBB65F6019E2FA3553A9C1FC60CC201
File CRC32: 9D01E44C
ROM SHA-1: 36A89DA160D9760F78B891E332F7DCABB6E90E70
ROM CRC32: FDDF2135