I know someone made one of these topics a while back, but I was unable to find it and it was missing a few options. I figured that since the spoiler lock for Episode 15 has ended, it might be interesting to speculate on how the choices we took in our adventure will impact how the game ends.
If I miss some crossroads, please let me know so I can edit this post.
As far as I can remember, the choices include:
1) Whether or not you beg Fern
-Sigh... I admit I begged Fern...
2) Finding all of the police officers before facing the final Tangrowth
-I actually didn't know where the last police officer was until after Corey's death, and didn't know it would change the story
3) Joining the Aqua or the Magma gang
-Personally, I doubt this will change the ending of the game, but I chose team Aqua
4) Beating Garchomp in the boss fight with Solaris
-I let him curbstomp me since I didn't have any gimmick pokemon at the time.
5) Saving Heather or going on to fight Sirius
-I'm not going to just leave a girl be electrocuted by a madman just cause she's a brat! Now if it were Fern on the other hand...
6) Going upstairs or staying downstairs when Team Meteor invades
-I thought Laura, a member of the E4, would be able to handle a guy with a team of level 30-40 pokemon
7) Siding with El or Radomus
-I follow Lord Helix only! Jk, but El just kinda seemed like a fanatic, so I chose to beat Arceus. The Gardevoir with El was a fake, so...
8) How you answer Charlotte's question of how important the Ruby Ring is
-Said the Ruby Ring was more important than lives. She seemed happy with my answer, so...
9) Whether or not you give Blake the ring
-Kept it. didn't want Team Meteor to have another key. I got a shiny charm, so...
10) Giving Titania candy in the Water Treatment Center
-I honestly can't remember encountering this choice, but since I've never had Blue Moon Ice Cream, I'm assuming I missed my chance.
11) Whether or not you decide to fight Taka to save him from his father's wrath
-Taka's been passively helping us all the time, and covering his tracks just enough to stay as an Admin. I decided I owed him at least this one favor.
EDIT: Some kind people pointed out some spots I missed, and cramming them is chronological order would ruin all the other posts.
12) Whether or not you say your are a new student when you speak with Kiki.
-Yes
13) Whether or not you claim to have seen Titania chatting with a grunt in the woods.
-Yes
14) Whether or not you admit to reading the diary.
-No
15) Whether or not you tell Amaria what was in the diary.
-No