Okay, here’s my attempt at a team. Wi-Fi since I’ll rarely play competitor.
Swampert @ Leftovers
Relaxed Nature
252 HP / 58 Atk / 200 Def
-Earthquake
-Arm Hammer
-Hydro Pump
-Stealth Rock
Stealthpert lead.
Raikou @ Leftovers
Timid Nature
252 Sp.Atk / 244 Spd / 14 HP
-Thunderbolt
-HP [Ice]
-Calm Mind
-Substitute
I always wanted to use this and I’ve already got this In-game from Colloseum. (IVs are good except for HP/Def) I would’ve liked to get HP Grass, but SR’ing for this takes about 5-7 min per try and got me extremely bored. How much would HP Ice [BP 61, Sp.Atk 325] do on Garchomp?
Weavile @ ChoiceBand
Jolly Nature
252 Atk / 252 Spd / 6 HP
-Blade Test
-Ice Punch
-Brick Break
-Pursuit
Helps against Azelf and Garchomp.
Weezing @ Leftovers
Bold Nature
196 HP / 252 Def / 62 Sp.Atk
-Flamethrower
-Thunderbolt
-Will-o-Wisp
-Pain Split
F-thrower for Heracross, T-bolt for Gyarados.
Togekiss @ Leftovers
Timid Nature
228 HP/ 82 Sp.Atk / 200 Spd
-Air Slash
-Thunderwave
-Grass Rope
-Wish
Paraflinch is fun, Grass Rope for Swampert, and Wish for the team.
Heatran @ Adherence Scarf
Rash Nature
252 Sp.Atk / 252 Spd / 6 Atk
-Overheat
-HP [Grass]
-Dragon Pulse
-Explosion
HP Grass helps against Swampert, Heatran will take one for the team by exploding on Blissey to help out Raikou.
Tyranitar- Weezing, Swampert
Gyarados- Raikou, Weezing
Infernape- Swampert for non-Grass Rope, not sure what else counters it.
Azelf- Weavile, Togekiss, Heatran
Rhyperior- Swampert, Togekiss
Electrivire- Swampert for non-HP Grass, which won’t be common on Wi-Fi
Heracross- Togekiss, Heatran, Weezing
Salamence- Weavile, Heatran
Garchomp- Weezing, Weavile
Blissey- Swampert, Weavile, Heatran
Alakazam- Weavile, Togekiss kind of
I think those are the main ones. I'm not sure if the list is accurate so correct if I messed up somewhere.

Swampert @ Leftovers
Relaxed Nature
252 HP / 58 Atk / 200 Def
-Earthquake
-Arm Hammer
-Hydro Pump
-Stealth Rock
Stealthpert lead.

Raikou @ Leftovers
Timid Nature
252 Sp.Atk / 244 Spd / 14 HP
-Thunderbolt
-HP [Ice]
-Calm Mind
-Substitute
I always wanted to use this and I’ve already got this In-game from Colloseum. (IVs are good except for HP/Def) I would’ve liked to get HP Grass, but SR’ing for this takes about 5-7 min per try and got me extremely bored. How much would HP Ice [BP 61, Sp.Atk 325] do on Garchomp?

Weavile @ ChoiceBand
Jolly Nature
252 Atk / 252 Spd / 6 HP
-Blade Test
-Ice Punch
-Brick Break
-Pursuit
Helps against Azelf and Garchomp.

Weezing @ Leftovers
Bold Nature
196 HP / 252 Def / 62 Sp.Atk
-Flamethrower
-Thunderbolt
-Will-o-Wisp
-Pain Split
F-thrower for Heracross, T-bolt for Gyarados.

Togekiss @ Leftovers
Timid Nature
228 HP/ 82 Sp.Atk / 200 Spd
-Air Slash
-Thunderwave
-Grass Rope
-Wish
Paraflinch is fun, Grass Rope for Swampert, and Wish for the team.

Heatran @ Adherence Scarf
Rash Nature
252 Sp.Atk / 252 Spd / 6 Atk
-Overheat
-HP [Grass]
-Dragon Pulse
-Explosion
HP Grass helps against Swampert, Heatran will take one for the team by exploding on Blissey to help out Raikou.
Tyranitar- Weezing, Swampert
Gyarados- Raikou, Weezing
Infernape- Swampert for non-Grass Rope, not sure what else counters it.
Azelf- Weavile, Togekiss, Heatran
Rhyperior- Swampert, Togekiss
Electrivire- Swampert for non-HP Grass, which won’t be common on Wi-Fi
Heracross- Togekiss, Heatran, Weezing
Salamence- Weavile, Heatran
Garchomp- Weezing, Weavile
Blissey- Swampert, Weavile, Heatran
Alakazam- Weavile, Togekiss kind of
I think those are the main ones. I'm not sure if the list is accurate so correct if I messed up somewhere.