XY as so many new things are introduced and my love for changing ya appearance. I also like Moon and US. I just couldn't get into oras, while I did like the first games of it
Personally, I enjoyed X&Y the most. They weren't my favorite games ever, but I did spend quite a lot of time with them simply because they felt new and interesting. It introduced some different mechanics and styles like hordes, the amazing PSS, and rollerskates (lol).
Ahh, that's a hard one. I loved ORAS and XY, but I feel like S/M was better. For ORAS, I haven't played that much, and XY had all those annoying rivals that didn't even do anything. *cough cough* Tierno and Trevor *cough*
ORAS for me. Felt great to relive my favorite Pokémon memories in games that were made so much better. The music was great, and Steven Stone's updated design looked great too. The Kyogre and Groudon rain/drought theme were as chilling as ever and I loved Super Secret Bases. Thank you ORAS for existing. <3 But really...the 3DS Pokémon games were all really good and I love 'em all.
This is tough because in retrospect I kinda don't like any of them, haha. Maybe Ultra Moon. It was decent.
Probably ORAS, yeah they're remakes but I like them more than SM/USUM tbh, I like playing through them a lot more because there's not cut-scenes everything.
Soul Silver was the first and in my opinion, the best. I find it’s forgive to be more charming and the dreaded fairy type doesn’t exists in it yet
My favorite 3ds game is obviously Pokémon Super Mystery Dungeon. I can't believe how unpopular this game is. I didn't really like a lot of the 3ds games. The only other one that I liked was ORAS. However, Super Mystery Dungeon was a throw back to what made the series great, good writing. Did they pull that off? Yeah, at least not as good as it was in explorers of sky, but I thought they made a good story and game. Although I did get annoyed at how stupidly difficult some parts would be, the story and gameplay kept me going and that's something Pokémon has never done for me in a main series game.
I'd have to say Pokémon X/Y is one of my favorite 3DS games because it brought the 3D experience to the Pokémon games. It also featured some nice internet features that the DS games didn't have.