Argamis
Silver Dis-Astḗr
I like that bolded **FAMILY** that _*Princess_* Sincere Scholar conveniently said; since (technically speaking) NONE of her 4 components are _*related_* to Queen Galaxia´s & Morning in any meaningfull way (either by blood, adoption or proper friendship).
-> Cheerilee & Twilight may had being "good acquantainces" given their little onscreen interaction on seasons 1 & 2.
-> Spitfire & Rainbow had to "work together" (either as Leader&wingpony, or as true equals), but that is not friendship.
The other two DESPISE Twilight & Rainbow for different reasons.
Scholar & Mythic "relationship" via Trixie & Starlight should be enough for them to be good friends.
-> Cheerilee & Twilight may had being "good acquantainces" given their little onscreen interaction on seasons 1 & 2.
-> Spitfire & Rainbow had to "work together" (either as Leader&wingpony, or as true equals), but that is not friendship.
The other two DESPISE Twilight & Rainbow for different reasons.
Scholar & Mythic "relationship" via Trixie & Starlight should be enough for them to be good friends.