If you want the final boss to appear with a special attack rather than running toward you, you have to use an x-value smaller than the "bound" and add an "act" starting on the proper frame. With some characters, this effect looks actually really good (examples below). You can also create extra Frames and activate these with the "act"!
id: 7 hp: 50 act: 288 x: 400 #Firen_explosion
id: 8 hp: 50 act: 264 x: 400 #Freeze_whirlwind
id: 10 hp: 50 act: 299 x: 400 #Woody_teleport
id: 51 hp: 50 act: 257 x: 400 #Firzen_volcano
id: 52 hp: 50 act: 310 x: 400 #Julian_explosion
Here's a study example:
Boss Appear |
Inspired by MH-Razen