My collection of Megami Tensei games as of the 5th of April, 2019
Games in my collection:
Shin Megami Tensei - iOS
Shin Megami Tensei - PS3
Shin Megami Tensei II - PS3
Shin Megami Tensei III: Nocturne Maniax(Lucifer's Call) - PS2
Shin Megami Tensei III: Nocturne Maniax(Lucifer's Call) - PS3
Shin Megami Tensei if... - PS3
Shin Megami Tensei: Devil Children Black Book & Red Book - PS3
Shin Megami Tensei Liberation Dx2 - iOS(i play it on android though)
Digital Devil Saga: Avatar Tuner - PS2
Digital Devil Saga 2: Avatar Tuner - PS2
Devil Summoner: Raidou Kuzunoha vs. The Soulless Army - PS3
Devil Summoner 2: Raidou Kuzunoha vs. King Abaddon - PS3
Persona - PSVITA
Persona 2: Innocent sin - PS1
Persona 2: Eternal Punishment - PS3
Persona 3 - PS2
Persona 3 FES - PS3
Persona 4 - PS2
Persona 4 Golden - PSVITA
Persona 5 - PS4
i also have Catherine on PS3 if you also consider it to be MegaTen.