Rarity is my favourite of the Mane 6 in general, but she’s also my favourite specific to season 4. She’s shown a lot of character development since the early days of season 1, a lot more than the other ponies in my opinion. And lets face it, any episode where Rarity has a main role and/or a solo is going to be a good episode.
When the going gets tough. Why Get a Loan From Us?