All episodes of My Little Pony: Friendship is Magic on Netflix and Hulu combined (USA) as of 2022. Unfortunately, Seasons 5-8 is officially removed back in February 1st, 2022. This is what you get now, 117 episodes left to watch out of 223 in total (with Best Gift Ever and Rainbow Roadtrip special counted). Your only option now is Season 1-4 and Season 9. Fyi, MLP still available on Hulu, but for Netflix, Season 1-4 is for USA only while the rest of the world is just Season 1. Put lot of placements of Season 9 episodes to replace Season 5 from previous owner due to Season 5-8 removal from service.

R.I.P Season 5-8 of MLP:FiM :(
But that's not the end, this show may still exist in matter of time until their streaming service on the go will remove that ones too, sadly the Season 5-8 will never reinstate to Netflix (USA and any country who have Season 8) as of now (or Season 2-6 (mostly) / Season 2-5 (UK and Ireland) for the rest), and it's been 5 months already since the removal.