My recommended Hybrid-PONY prompt scores and negatives:

Prompt: score_9, score_8_up, score_7_up Negative: score_1, score_2, score_3, score_4, text, watermark, branding

My recommended SDXL-Only negatives:

Negative: text, watermark, branding

Additional Pony Specific Prompt Help:

First off, this requires a bit of understanding as to how Pony works. I recommend some light reading first if you are new to Pony: https://civitai.com/articles/7052/pony-prompts-for-dummies