If it was Tera Dragon then the Grass immunity to powder moves doesn't apply. You lose all secondary benefits of any typings you used to have along with their weaknesses. Only the STAB bonus is retained.
More relevant to answering the question, most status effects aren't valuable in Raids. Paralysis and Burn are pretty useful, due to the chance for the Pokemon to not attack or to reduce their physical Attacking power (respectively), and the 1 time I saw a Freeze was incredible, but Sleep and Confusion don't seem to matter at all. For Sleep, because it attacks all 4 Pokemon every round I think Sleep will only "block" those 1 to 3 attacks, resulting in you getting hit regardless (while ally Pokemon are not). And I have yet to see a Raid Pokemon hurt itself in confusion.