It's simple. Add yourself attacking him. Just a few rules though: -Have a health variable. -Don't be overpowered. -Don't give yourself a spammable heal.
Thanks to KoopasRock, 3_joined_accounts, and spikeystudio Introducing Fire Naluigi! This sprite won't be added in Naluigi Sprites that fast but just watch him here I gave Spikey more health Since Dark Koopa Loopa has so much health I made him have less health Naluigi Update: I added a sprite to know when he heals himself