Ho-oh couldn't be made on pony so i made a lora. It can make anthro Ho-oh pretty well, but struggles alot with regular Ho-oh. (Pony hate birds).
Use strength between: 0.5 and 1.0

Helpful tags:

pokemon \creature, Ho-oh, anthro, beak, bird, red body, red feather, (no human)

Optional (no required): Avian, Yellow feather, white feather, green feather, wings

Negative tags: blurry, glowing, outlines, (wings)

Many images depict Ho-oh with white outlines or a white glow around him. Try to add glowing/ outlines as negative prompt. to diminish the effect

After some testing I decided, that i will make an update of this lora. Adding more images to the database and better prompting