Yes, let's discuss Pokémon cries because I have a lot to say about them. I feel that they are a great aspect of Pokémon that aren't talked about often. To answer your questions:
-What are your favourite Pokémon cries?
Abomasnow – I swear I can hear it shouting Obama
Aggron – All aboard the choo-choo train!
Alomomola – Sounds kind of funny
Celesteela – Odd sounding cry for an odd Pokémon
Chatot – For some reason, hearing this cry brings back amazing memories in my life
Chandelure – Doesn't sound natural in a good way
Cherrim – Very cute cry for a very cute Pokémon (in its sunshine form)
Cofagrigus – How can you not love it
Combee – Very cute
Combusken – I love the way it sounds and love imitating it
Cresselia – Very cute cry, almost catlike
Decidueye – Awesome cry
Espeon – Cute sound
Delphox – Sounds like it's screaming WTF
Donphan – Another one of those cries that bring back good memories
Drifblim – You can rap to that cry
Dialga – I'm not really sure why, but I just love the way the cry sounds
Empoleon – You can tell it means business
Eternatus – For some reason, its cry brings back good memories
Feraligatr – Sounds almost exactly like a bellowing alligator
Froslass – A combination of cute and creepy
Giratina – Sounds like a scream from the underworld
Gothitele – Sounds like a horror movie sound effect
Grapploct – "I smell cheese"
Heatmor – Sounds like an actual living thing
Heatran – It sounds like something malfunctioning, but in a cute way
Heracross – Sounds like it's screaming OH MY GOD
Honchkrow – A combination of a motorcycle revving and a scary death bird call
Jynx – I love the rhythm
Kricketune – How can you not love that cry
Kyorge – Loud but cute sounding screech
Litleo – Possibly the cutest cry ever
Lumineon – Sounds soothing to the ears and relaxing
Magnezone – Sounds like a mechanical Pacman dying
Malamar – I don't know why, but it sounds really good
Meloetta – Nice singing tone
Mismagius – Sounds very playful, but kind of creepy at the same time
Medicham – You can make some good music with that cry
Musharna – So weird and mysterious
Nidoking – Sounds intense
Palossand – OOOOOOOOOHHHHH
Parasect – Sounds like Mewtwo's cry
Phione – Very cute
Porygon-Z – Sounds like its glitchy and out of control
Regigigas – Another cry you can rap to
Reshiram – Beautiful cry for a beautiful Pokémon
Rotom – Iconic sound that I've grown to like from playing the Alola games
Serperior – Iconic sound for me as my first starter
Skorupi – Sounds cute for a poisonous scorpion
Sylveon – A cute cry that suits its appearance
Swoobat – Cute cry
Tapu Fini – Creepy but cute
Togekiss – Sounds like something that isn't a living being, but good too
Turtonator – Sounds like a motorcycle engine revving up
Umbreon – Sounds good
Uxie – Very cute cry for a very cute critter
Victreebel – Very soothing to the ears
Virizion – Simply love it
-What are your least favourite Pokémon cries?
I can't really say that I have a least favorite cry because I never felt that strongly about them to dislike them, but I probably have to say Single-Strike Urshifu because you can barely hear it.
-What cry do you find the most badass? How about cutest, funniest, saddest, weirdest or grossest cries?
The most badass Pokémon cry probably belongs to Empoleon, but Turtonator also applies, as well as Samurott. The cutest cry belongs to Litleo. The saddest cry belongs to. As for the weirdest cries, well, there are quite a few of those. Regigigas sounds like a bunch of unnatural sounding noises. Drifblim sounds like a Hip-Hop beat. Kricketune is iconic, but that doesn't make it any less weird. Gallade has that little sound effect at the end of his cry. Aurorus cry is weird and unnerving to me. It sounds like the screams of 1,000,000 suffering souls or something. It's so weird. As for the grossest cry, that definitely belongs to Skuntank because it sounds like it's doing a messy number two.
-What do you think of Pikachu and Eevee's cries across all generations? Should they be voiced, or should they remain similar to all others?
I believe that Pikachu and Eevee should have their old cries without being voiced. I get that they are supposed to be mascots for Pokémon, but that doesn't mean they should receive special treatment. Pokémon Scarlet and Violet made the right choice with them this generation.
-What do you make of the recent (PLA/S/V) change regarding Pokémon cries playing in battle? Does it fit the atmosphere and new style of the games, or does it annoy you?
I love it. It makes Pokémon feel more like living, breathing creatures that vocalize and express themselves.
-Would you change any Pokémon's cry? If so, what to and why?
I would probably change Haxorus' cry back to its old cry before the remaster of cries. I would probably make Single-Strike Urshifu sound more ferocious.
Another thing I wanted to mention about Pokémon cries is that, in my opinion at least, many Pokémon stopped sounding like living things around generation IV. For example, if you listen to most of the cries in generation III, a lot of the Pokémon actually sounded like creatures you'd hear in real life or at least living things. In generation IV however, so many Pokémon started to sound weird like Magnezone, Electivire, Regigigas, Drifblim, and so on. Personally, I prefer the more realistic cries over those.