This is a hack of Nekketsu Kakutou Densetsu that changes the playable characters to Kirby, Mario, Jigglypuff, and Pikachu. It utilizes the English-translated version from 1998.
Database match: Nekketsu Kakutou Densetsu (Japan)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
File SHA-1: 13266BC2E52D37BCC1987D04FA6F62B1752A7DBE
File CRC32: 1D714F05
ROM SHA-1: E7AD3BE8DB19F705CB4BF834554FD8E0CC20E4E2
ROM CRC32: 37E24797