I covered all answers during my playthroughs, but these are the ones I made during my first run.
1) Whether or not you beg Fern
Hell no! I won't be kneeling to this scrub even if I had to tor in that cage. Funny thing is, I never knew about the Chatot during that play. It was episode 10 and I had Ralts in my team, so I just teleported out of it.
2) Finding all of the police officers before facing the final Tangrowth
No. I haven't done the last one because I wanted to fight the Tangrowth as soon as possible.
3) Joining the Aqua or the Magma gang
Aqua. The alley in Lapis Ward is closer to the Pokecenter, so it makes a better grinding spot. I joined the gang because I was spending a lot of time there anyway.
4) Beating Garchomp in the boss fight with Solaris
Nope. I was amazed by that fight and the cutscene that followed, so I just went with it.
5) Saving Heather or going on to fight Sirius
Saving Heather. I thought that was the point of the raid anyway, and I wanted to free her as soon as possible.
6) Going upstairs or staying downstairs when Team Meteor invades
Staying downstairs. I thought that Laura could handle herself. She was an E4 after all. Well, I didn't cosider that Sigmund would attack her and not the Liligant.
7) Siding with El or Radomus
Radomus. I kinda spoiled myself on this one by watching Shofu's playthrough. Man, I was surprised when it showed up that I had to defeat the Dittoceus to proceed.
8) How you answer Charlotte's question of how important the Ruby Ring is
I answered that the lives are more important then the ring. I'm a softie.
9) Whether or not you give Blake the ring
My first answer was no, but then gave him the ring when Shelly asked for it.
10) Giving Titania candy in the Water Treatment Center
I gave her the candy, I had tons of those anyway.
11) Whether or not you decide to fight Taka to save him from his father's wrath
Fight. I knew that the better choice would for him to gather the courage and stand against Solaris himself, but I really wanted to see his new team.