How does this seem?

[PepperDip]

Before I go into breeding and such, what suggestions do you guys have for my current set-up?

Talonflame:
Nature: Adamant
Ability: Gale Wings
EVs: 192 HP / 252 Atk / 4 Def / 60 Speed
-Brave Bird
-Flare Blitz
-Swords Dance
-Roost

Breloom:
Nature: Jolly
Ability: Poison Heal
EVs: 4 HP / 252 Atk / 252 Speed
-Spore
-Sky Uppercut
-Rock Tomb
-Giga Drain

Swampert:
Nature: Relaxed
Ability: Torrent
EVs: 252 HP / 196 Def / 60 Sp. Atk
-Earthquake
-Surf
-Stealth Rock
-Ice Beam

Salamence:
Nature: Naughty
Ability: Intimidate
EVs: 4 HP / 252 Atk / 252 Speed
-Flamethrower
-Dragon Claw
-Dragon Rush
-Roost

Manectric:
Nature: Timid
Ablility: Static
EVs: 4 HP/252 Sp. Atk/252 Speed
- Charge Beam
- Thunderbolt
- Flamethrower
-Volt Switch

Metagross:
Nature: Adamant
Ability: Clear Body
EVs: EVs: 80 HP / 252 Atk / 176 Speed
-Meteor Mash
-Earthquake
-Zen Headbutt
-Ice Punch

 

[PlatinumDude]

Items would be greatly appreciated on your Pokemon.

The OR/AS Megas are at the 110 Speed tier or breach it; an example is Mega Metagross. Raikou is also becoming more prominent. Because of this, Talonflame has to be Jolly with 252 Atk/4 Def/252 Spe. Sure, this seems redundant with Gale Wings, but this allows Talonflame to outspeed Raikou and Thundurus and hit either of them with Flare Blitz.

Giga Drain runs off of Breloom's terrible Special Attack, so it's not advised on it. Sky Uppercut isn't a bad attack by any means, but it's outclassed by Mach Punch because it provides much-needed priority for Breloom, since it isn't that fast. Tl;dr:
-Spore
-Bullet Seed
-Mach Punch
-Rock Tomb
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Focus Sash
Ability: Technician

Simply put, regular Swampert is badly outclassed by other bulky Water and/or Ground Pokemon like Garchomp, Therian Landorus, and even Gastrodon and Empoleon, as they either have more power, better support options or a combination of the two:

Garchomp:
-Stealth Rock
-Dragon Tail
-Earthquake/Toxic
-Fire Blast/Toxic
Nature: Impish
EVs: 252 HP/164 Def/76 SDef/16 Spe
Item: Rocky Helmet
Ability: Rough Skin

or
-Stealth Rock
-Outrage/Dragon Claw
-Earthquake
-Fire Blast/Swords Dance
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: Lum Berry/Focus Sash

Therian Landorus:
-Stealth Rock
-Earthquake
-U-turn
-Stone Edge/Rock Slide/Knock Off
Nature: Impish
EVs: 252 HP/240 Def/8 SDef/8 Spe
Item: Leftovers/Rocky Helmet

or
-Stealth Rock
-Earthquake
-U-turn/Swords Dance/Explosion
-Stone Edge/Smack Down/Knock Off
Nature: Adamant/Jolly
EVs: 72 HP/252 Atk/184 Spe
Item: Soft Sand/Earth Plate/Normal Gem

Gastrodon:
-Scald
-Earthquake/Earth Power/Ice Beam
-Toxic
-Recover
Nature: Relaxed/Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Storm Drain

Empoleon:
-Scald
-Roar
-Toxic/Stealth Rock
-Defog/Stealth Rock
Nature: Calm
EVs: 248 HP/8 Def/252 SDef
Item: Leftovers
Ability: Torrent

With its Mega Stone banned from standard play, Salamence is badly outclassed by other Dragon Pokemon, with Dragonite being a prime example, as well as Garchomp. Examples of better Dragon Pokemon include the aforementioned Garchomp and Dragonite, as well as Dragalge, Hydreigon and either of the Lati twins:

Dragonite:
-Dragon Dance
-Outrage/Dragon Claw
-Earthquake/Fire Punch
-Extreme Speed
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Lum Berry
Ability: Multiscale

or
-Outrage
-Extreme Speed
-Earthquake/Superpower
-Dragon Claw/Fire Punch
Nature: Adamant/Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Band
Ability: Multiscale

or
-Dragon Claw
-Earthquake/Fire Punch
-Extreme Speed
-Roost
Nature: Adamant
EVs: 216 HP/64 Atk/228 SDef
Item: Leftovers
Ability: Multiscale

Hydreigon:
-Draco Meteor
-Dark Pulse
-Flash Cannon/Focus Blast
-Superpower/Earth Power
Nature: Mild/Modest
EVs: 4 Atk/252 SAtk/252 Spe
Item: Life Orb

or
-Draco Meteor
-Dark Pulse
-Earth Power
-U-turn
Nature: Modest/Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf

Dragalge:
-Toxic Spikes
-Sludge Wave
-Draco Meteor
-Focus Blast/Hidden Power (Fire)
Nature: Modest
EVs: 228 HP/252 SAtk/28 Spe
Item: Dragon Fang/Draco Plate/Black Sludge
Ability: Adaptability

or
-Toxic Spikes
-Dragon Tail
-Sludge Wave
-Scald/Haze
Nature: Calm
EVs: 252 HP/228 SDef/28 Spe
Item: Black Sludge
Ability: Adaptability

or
-Sludge Wave
-Draco Meteor
-Scald/Focus Blast
-Hidden Power (Fire)/Focus Blast
Nature: Modest
EVs: 228 HP/252 SAtk/28 Spe
Item: Choice Specs
Ability: Adaptability

Latias:
-Draco Meteor
-Psyshock/Hidden Power (Fire)
-Defog
-Healing Wish
Nature: Timid
EVs: 72 HP/184 SAtk/252 Spe
Item: Life Orb

Latios:
-Draco Meteor
-Psyshock
-Surf/Hidden Power (Fire)/Earthquake
-Defog/Roost
Nature: Timid/Hasty
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb

or
-Draco Meteor
-Psyshock
-Surf/Hidden Power (Fire)/Tailwind
-Trick
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Scarf

Manectric and Metagross are only good in their Mega forms; their regular forms are outclassed otherwise. Manectric really needs Hidden Power Ice to get past Dragons; it's useless against them without it. Overheat is also preferred over Flamethrower despite the Special Attack drop because Manectric needs the extra power against things like Ferrothorn and Excadrill:
-Thunderbolt
-Volt Switch
-Overheat
-Hidden Power (Ice)
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Manectite
Ability: Lightning Rod

Mega Metagross' Speed of 110 is very good, so I don't think that should be wasted on an all-out attacker. Your current nature and EV spread is better suited for an Agility set, as you're already boosting your Speed anyways:
-Meteor Mash
-Zen Headbutt
-Bullet Punch/Ice Punch/Grass Knot
-Earthquake/Hammer Arm
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Metagrossite
Ability: Clear Body

or
-Agility
-Meteor Mash
-Zen Headbutt
-Earthquake/Hammer Arm
Nature: Adamant
EVs: 80 HP/252 Atk/176 Spe
Item: Metagrossite
Ability: Clear Body

Depending on who you pick as your Mega, here are better Electric/Steel alternatives (you don't use Electric and Electric and Steel and Steel together, of course):

Wash Rotom:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Rest
Nature: Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers/Chesto Berry

Thundurus:
-Thunderbolt
-Hidden Power (Ice)
-Focus Blast/Psychic
-Thunder Wave
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb/Leftovers
Ability: Prankster

or
-Nasty Plot
-Thunderbolt
-Hidden Power (Flying/Ice)
-Thunder Wave/Substitute/Focus Blast
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Leftovers/Life Orb
Ability: Prankster

or
-Thunderbolt
-Hidden Power (Ice)
-Knock Off
-Thunder Wave/Superpower
Nature: Naive
EVs: 76 Atk/180 SAtk/252 Spe
Item: Life Orb

Scizor:
-U-turn
-Bullet Punch
-Superpower
-Pursuit/Knock Off
Nature: Adamant
EVs: 248 HP/252 Atk/8 SDef
Item: Choice Band
Abiilty: Technician

or
-Swords Dance
-Bug Bite
-Bullet Punch
-Superpower
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb

Bisharp:
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit/Swords Dance
Nature: Adamant/Jolly
EVs: 252 Atk/52 SDef/204 Spe
Item: Black Glasses/Dread Plate/Life Orb/Lum Berry
Ability: Defiant

or
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit
Nature: Adamant
EVs: 192 HP/220 Atk/96 Spe
Item: Assault Vest
Ability: Defiant

 

[LordDirtyBrit]

@PepperDip: How are you going to be battling opponents? If you are going to be using cartridge based means such as Battle Spot, maybe you could be able to use Mega Salamence. Obviously you'd have to replace Metagross if you're going in that direction, can I suggest Bisharp, Excadrill or Scizor as its replacement. I highly endorse Excadrill as it will be able to remove Stealth Rock for Mega Salamence, meaning it will be able to switch in easier.

Excadrill @ Leftovers
Ability: Mold Breaker
EVs: 252 HP / 4 Atk / 252 SpD
Careful Nature
- Earthquake
- Iron Head
- Rapid Spin
- Stealth Rock

 

[Nah]

I believe that he's playing cartridge since he mentioned breeding, so he can use Mega Salamence. That said, he may want to swap out one or 2 of those potential Mega Pokemon because while you can get away with having 2 Megas on the team, all 4 of them arguably really should be in Mega form.

@Platinum: max Speed EVs isn't necessary for Talonflame to outspeed Raikou/Thundurus. 168 and Jolly lets it outspeed Timid 252 Raikou by 2 points.

 

[PlatinumDude]

I believe that he's playing cartridge since he mentioned breeding, so he can use Mega Salamence. That said, he may want to swap out one or 2 of those potential Mega Pokemon because while you can get away with having 2 Megas on the team, all 4 of them arguably really should be in Mega form.

@Platinum: max Speed EVs isn't necessary for Talonflame to outspeed Raikou/Thundurus. 168 and Jolly lets it outspeed Timid 252 Raikou by 2 points.

The extra HP EVs don't let Talonflame do anything notable, so you might as well run max Speed.

 

[PepperDip]

@PepperDip: How are you going to be battling opponents? If you are going to be using cartridge based means such as Battle Spot, maybe you could be able to use Mega Salamence.

Yeah, cartridge based.

 

[LordDirtyBrit]

Then have Swampert, Manectric and Metagross replaced with the above suggestions. Always make use of Mega Salamence in a metagame where it isn't banned.

 

[PepperDip]

I have a question. Obviously I'm new to this sort of stuff so: Where would you use competitive ratings such as U, OU, RU, etc? I've seen them on Smogon but only used in their simulator.

 

[Nah]

I have a question. Obviously I'm new to this sort of stuff so: Where would you use competitive ratings such as U, OU, RU, etc? I've seen them on Smogon but only used in their simulator.

Smogon's tiers are only enforced on Pokemon Showdown servers, or if the 2 parties involved the battle agree to use Smogon rules/tiers beforehand.