I'm not trying to be rude or anything, but NickofTime, you truly do need to learn how to rate teams better. It can be a little difficult to understand what you have typed, and it really isn't always the best advice. I'm being sincere here, I'd seriously suggest lurking some more "established members" such as Dark Azelf, Aurafire, and Gamer's rates, as they truly provide insight on weaknesses. And if you want to respond to this, do it via VM, instead of spamming this RMT.
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Gyarados isn't a Dragon type, and therefore doesn't get STAB from Dragon Pulse. Breloom doesn't learn Close Combat.
As it appears that you a new to the competitive battling scene, welcome! First off, click
here as it will link you to a guide that acts as an introduction to competitive Pokemon, which will help you with EVs (Some are okay, others...not so much) and movesets (The majority are iffy). Secondly, click
here for a list of all Pokemon with movesets that are proven to work in the competitive metagame.
Just to point some things out for you (As I'm not going to go through a full-out rate), Dragon Dance on Gyarados works, but not with Dragon Pulse. That is a special-based move, where Dragon Dance increases attack. A normal Gyarados set would generally look like this:
Gyarados@Life Orb
Intimidate
Adamant Nature
252 Atk/252 Spe/4 HP
- Dragon Dance
- Waterfall
- Stone Edge
- Earthquake/Bounce
Dragon Dance will help each attack do more damage. Waterfall provides a solid water-type STAB, where Stone Edge and Earthquake help provide more type coverage. You can also use Bounce as a secondary STAB move, which together with Water, have near-perfect neutral type coverage by themselves.
For Breloom, the item of choice is usually a Toxic Orb, which will provide Poison to heal with its ability Poison Heal. The standard Breloom is generally a set with Substitute and Spore, looking something like this:
Breloom@Toxic Orb
Poison Heal
Adamant Nature
252 Atk/244 Spe/12 HP
- Spore
- Substitute
- Focus Punch
- Seed Bomb
Spore the first turn to put something to sleep, then Substitute the next. Behind the Substitute, Breloom can fire off either STAB move of choice safely, and won't have to worry about Focus Punch failing as it won't be interrupted.
As for Scizor, it WANTS a Choice Band, so you'll probably just going to have to dig one up from either or WiFi section or using the Battle Tower/Frontier to get some BP. It is actually fine, but Pursuit over Quick Attack is preferable as you can essentially trap Ghost types as the switch out for super effective damage.
Flygon is...not doing so well. Your team truly lacks speed in general, so a Choice Scarf set to help scout the opponents team early in the game would work nicely. We just need to change the EV Spread and moveset a little.
Flygon@Choice Scarf
Levitate
Jolly Nature
252 Atk/252 Spe/4 HP
- Outrage
- Earthquake
- U-Turn
- Stone Edge/Fire Blast
Outrage is more of a late-game move, as you don't want to get locked into it early on. Earthquake is always a reliable STAB move. The use of U-Turn early game will allow you to scout your opponents team and see their counter or check for Flygon. For this team, I would use Stone Edge in the last slot over Fire Blast, as revenge killing Gyarados after a Dragon Dance is much more important to this team than Flygon beating Skarmory, especially since you have Heatran anyways.
Even with all these changes, this team still isn't all that good. I guess the main issue here is that this team is truly just 6 Pokemon thrown together with no common objective in mind. For a team, you want to have a goal when building it, whether it be to sweep with an individual Pokemon, stall the other team, or use one sweeper to weaken another's counters in a more offensive style. You also don't truly have a lead Pokemon, which can generally set up Stealth Rock for you. You could technically switch around Heatran's moveset to function as a proper lead.
Heatran@Shuca Berry
Flash Fire
Naive/Timid Nature (Whichever you can get, as you haven't specified if you have one nature or the other)
252 SpA/252 Spe/4 HP
- Stealth Rock
- Fire Blast
- Earth Power
- Explosion
That functions much more as an effective lead, setting up Stealth Rock, and using the Shuca Berry to reduce Ground type moves damage (As Earthquake is one of the most common moves in the game). You can then use Fire Blast and Earth Power to attack (And if you can bring Heatran into the game later, all the better). Explosion is always a great way to go out with a bang as well.
But still, it's hard to revise a team completely when there isn't any true strategy in mind. I would seriously recommend reading the guide I provided to you at the very beginning of this wall of text, and the use of the list of Pokemon move sets should help you significantly.
Blissey @ Leftovers
Scizor @ Choice Band
Flygon @ Choice Scarf
Gyarados @ Life Orb
Heatran @ Choice Scarf
Breloom @ Toxic Orb