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Gothitelle being Psychic/Dark is the one typing change I desperately want.
They already learn Dark type moves, a good variety in fact. I know some other Psychics do, but it's interesting how Gothita just starts off with some dark moves, like Flatter and Embargo. It'd gain huge weaknesses to Bug types, but hold their own better against Dark types now. It'd also help make them more unique compared to Gardevoir, which overshadows them in every single way (sadly) The only real issues I see from a design standpoint is that Dark seems to mostly be about trickery and deception, generally evil things, while Gothitelle is associated with the stars and astrology. I suppose I could try and use Gothorita's dex entry about it manipulating sleeping children, but that's still rather weak. I guess not every Dark type needs to be pure evil?
In regards to Gen V's other Psychics, I think that making Reuniculus Psychic/Fighting would be interesting, since it would strengthen it being Gothitelle's White counterpart while also making it more unique. Psychic/Fairy Musharna, as well? Not sure if that really works, though. And Beheeyem could really use a Steel type Mega, or just an evolution in general. Steel because UFO + Beheeyem already seems pretty robotic.
As it stands all of Gen V's Psychics don't have any secondary typings, which puts them at a huge disadvantage nowadays.