Hi there. You see, I'm in now way new to pokemon, but I'm quite inexperienced with competitive battling. Sorry if this becomes a bit lengthy.
This time I just came up with partly for the subway in-game, and ended up using it against a couple friends with success. Each pokemon I trained myself (All but abomasnow), I had intended on using in singles OU, and even then I hadn't had any knowledge of making specialized sets. One way or another, I'mma end up RNG'ing and retraining plenty of my pokemon. There are other inherent problems that I recognize though, but I don't know how to go about fixing them. More than enough words I guess, here's my team.
Abomasnow w/focus sash
Quiet
252HP/252sAtk/4Def, 0 Spe IV
Blizzard/Giga Drain/Ice Shard/ Protect
This was an Abomasnow I had gotten from a friend. 0 Spe IV so it has the best chances of getting hail up, which adding in blizzard was where I started with this team (100% accuracy, and plenty of freezes). Giga Drain helps it take out Water and Ground types, as well as give him a tinge bit more survivability (sometimes he lasts, other times he drops pretty quickly). Ice Shard provides priority, and the only means of it on this team sadly. It has helped me a great deal in handling dragonite, salamence, and landorus.
Suicune w/Chesto Berry
Bold
252HP/140Def/116Spe, 31 IV's
Calm Mind/Icy Wind/Rest/Scald
This Suicune was originally meant to be a good partner for Abomasnow. Originally the plan was to join Abomasnow in Blizzarding the opponent with the 100% accuracy and 30% freeze chance with Hail up, or Calm Mind-ing and Resting off the Damage and status from Hail and battle, then activating the chesto berry and waking it. Scald provides me an STAB move with decent power that has a very useful burn chance. Recently I replaced Blizzard with Icy Wind to give it a try as a method of speed control, and help with the lack of accuracy when Hail is not present.
Terrakion w/Expert Belt
Jolly
252Atk/252Spe/4HP, 31 IV's
Protect/X-Scissor/Close Combat/Stone Edge
Wonderful pokemon in general, being fast and powerful. I had went with the simplest set I could think of possibly useful in doubles, and will probably replace Stone Edge and X-scissor with Rock Slide and something else that could be more useful, as X-Scissor barely ever does anything substantial. I'll probably change it to something along the lines of helping hand or swords dance eventually. The expert belt was for lack of a better item, opting to just go for more damage since I'd rather not be locked into anything with a choice item, or feel any particular worry over status.
Heatran w/Air Balloon
Modest
252sAtk/252Spe/4HP, Unchecked IV's
Protect/Heat Wave/Earth Power/Flash Cannon
When I caught it, I didn't really consider using it for much, so I just went for Modest and trained it. Later I figured it had good coverage with the former teammates, and was a nice switch-in from Abomasnow usually having Flash Fire and all, or from Hydreigon and crobat when I expect an Ice type move. The Air Balloon is on him just so he isn't killed as easily by Ground type moves, which it seems not even a shuca berry can help. So nothing too special about him really. Though he does happen to have the only non-Ice spread move on this team in the form of Heat Wave.
Hydreigon w/Dragon Gem
Timid
252sAtk/252Spe/4HP, Unchecked IV's
Fire Blast/Draco Meteor/Dragon Pulse/Focus Blast
Another one I kinda caught and trained on a whim honestly because it's a pretty awesome dragon and special attacker. When I trained it, I assumed speed would be more important than power, but plenty of times the speed matters, while probable 1-2HKO's become 3HKO's. That's the reason I chose to use a Dragon Gem on her, granting a great initial power boost to aid her. Dragon pulse provides less power without the -2 sAtk, Focus Blast is for steel, rock, and dark types, and fire blast is to take care of grass and ice types. In performance, I don't expect too much of it outside of taking down 1 or two pokemon with a boosted Draco Meteor or Fire Blast, and it does pretty decent in that.
Crobat w/Flying Gem
Jolly
252Spe/252Atk/4HP, 31/31/30/x/30/31
Acrobatics/U-turn/TailWind/Taunt
Caught and trained on whim, and just slapped in because I couldn't think of anything I had that would have more synergy. When I predict the opponent well enough that gem-boosted Acrobatics brings joy to me, and usually OHKO's or finishes the opponent's pokemon. Taunt gives me a chance to stop Trick Room and boosting set-ups. U-Turn provides less dangerous means of switching and I'm currently trying out Tailwind to help my other pokemon outspeed the opponent.This is probably the easiest one for me to re-catch and train, so I almost definitely will if he's a keeper.
This time I just came up with partly for the subway in-game, and ended up using it against a couple friends with success. Each pokemon I trained myself (All but abomasnow), I had intended on using in singles OU, and even then I hadn't had any knowledge of making specialized sets. One way or another, I'mma end up RNG'ing and retraining plenty of my pokemon. There are other inherent problems that I recognize though, but I don't know how to go about fixing them. More than enough words I guess, here's my team.

Abomasnow w/focus sash
Quiet
252HP/252sAtk/4Def, 0 Spe IV
Blizzard/Giga Drain/Ice Shard/ Protect
This was an Abomasnow I had gotten from a friend. 0 Spe IV so it has the best chances of getting hail up, which adding in blizzard was where I started with this team (100% accuracy, and plenty of freezes). Giga Drain helps it take out Water and Ground types, as well as give him a tinge bit more survivability (sometimes he lasts, other times he drops pretty quickly). Ice Shard provides priority, and the only means of it on this team sadly. It has helped me a great deal in handling dragonite, salamence, and landorus.
Suicune w/Chesto Berry
Bold
252HP/140Def/116Spe, 31 IV's
Calm Mind/Icy Wind/Rest/Scald
This Suicune was originally meant to be a good partner for Abomasnow. Originally the plan was to join Abomasnow in Blizzarding the opponent with the 100% accuracy and 30% freeze chance with Hail up, or Calm Mind-ing and Resting off the Damage and status from Hail and battle, then activating the chesto berry and waking it. Scald provides me an STAB move with decent power that has a very useful burn chance. Recently I replaced Blizzard with Icy Wind to give it a try as a method of speed control, and help with the lack of accuracy when Hail is not present.

Terrakion w/Expert Belt
Jolly
252Atk/252Spe/4HP, 31 IV's
Protect/X-Scissor/Close Combat/Stone Edge
Wonderful pokemon in general, being fast and powerful. I had went with the simplest set I could think of possibly useful in doubles, and will probably replace Stone Edge and X-scissor with Rock Slide and something else that could be more useful, as X-Scissor barely ever does anything substantial. I'll probably change it to something along the lines of helping hand or swords dance eventually. The expert belt was for lack of a better item, opting to just go for more damage since I'd rather not be locked into anything with a choice item, or feel any particular worry over status.
Heatran w/Air Balloon
Modest
252sAtk/252Spe/4HP, Unchecked IV's
Protect/Heat Wave/Earth Power/Flash Cannon
When I caught it, I didn't really consider using it for much, so I just went for Modest and trained it. Later I figured it had good coverage with the former teammates, and was a nice switch-in from Abomasnow usually having Flash Fire and all, or from Hydreigon and crobat when I expect an Ice type move. The Air Balloon is on him just so he isn't killed as easily by Ground type moves, which it seems not even a shuca berry can help. So nothing too special about him really. Though he does happen to have the only non-Ice spread move on this team in the form of Heat Wave.

Hydreigon w/Dragon Gem
Timid
252sAtk/252Spe/4HP, Unchecked IV's
Fire Blast/Draco Meteor/Dragon Pulse/Focus Blast
Another one I kinda caught and trained on a whim honestly because it's a pretty awesome dragon and special attacker. When I trained it, I assumed speed would be more important than power, but plenty of times the speed matters, while probable 1-2HKO's become 3HKO's. That's the reason I chose to use a Dragon Gem on her, granting a great initial power boost to aid her. Dragon pulse provides less power without the -2 sAtk, Focus Blast is for steel, rock, and dark types, and fire blast is to take care of grass and ice types. In performance, I don't expect too much of it outside of taking down 1 or two pokemon with a boosted Draco Meteor or Fire Blast, and it does pretty decent in that.

Crobat w/Flying Gem
Jolly
252Spe/252Atk/4HP, 31/31/30/x/30/31
Acrobatics/U-turn/TailWind/Taunt
Caught and trained on whim, and just slapped in because I couldn't think of anything I had that would have more synergy. When I predict the opponent well enough that gem-boosted Acrobatics brings joy to me, and usually OHKO's or finishes the opponent's pokemon. Taunt gives me a chance to stop Trick Room and boosting set-ups. U-Turn provides less dangerous means of switching and I'm currently trying out Tailwind to help my other pokemon outspeed the opponent.This is probably the easiest one for me to re-catch and train, so I almost definitely will if he's a keeper.
Problems-
-Fighting type weakness just waiting to be exploited
-No real supporters (Not much experience in using any supporter pokemon either)
-Sets not specialized for threats that could hurt them, and moves/items could probably be better.
-No priority
-Excadrill sweeps me with no trouble whatsoever
-When sucessfully set up, trick room is a serious pain for most of my team.
So, yeah...many problems but I don't know where to start. I've had surprising successes with this team honestly thanks to luck, and kinda obvious/simple opponents on the Random Matchup. Thank you all for your patience. I'm willing to try any ideas you may contribute.