Straight from Wario Land II, with differences. He energetically hops along the ground, and upon seeing you he delivers a furious Straight Punch, which will send you flying if it connects. If stomped on, bumped from behind or hit with a fireball, he will not be defeated; instead he just hides in his helmet and is pushed back a bit. The only ways to beat it is with a Star or thrown item. Yoshi can eat it too.
Details are included in the ASM file, and GFX are included in the ZIP. They use SP3.
It's a VERY strong enemy that can even punch you inside blocks to your death, so you must be carefull with it!
Converted to PIXI with SA-1 support.
2 minor optimizations (I have feeling that there's more places to do them, but... eh).
Some comments edited/added.
Fixed CFG setting that makes it being stunned when in yoshi's mouth, so now he simply eats it.