The trigger is "ellaPurnell".

There are two versions available, Base Pony and Pony Realism.

Pony Realism is trained on Pony Realism and would give best results on realistic models.

The second version is trained on vanilla Pony and is not as accurate but works on all pony models.

Source: https://civitai.com/models/623255?modelVersionId=707372