This is my usual OU competitive team, it's pretty solid against most teams except Sunny Day based ones due to Venusaurs...and the fact Sleep Power never seems to miss on me, but the shceme is simple, the steels protect the dragons from Ice, and the Dragons in turn protect them back while Infernape and Starmie offer all around support, overall my policy is to get in, hit the enemy fast and hard or die trying to do it, it's my battling style and I like my team to reflect that, I also like simplicity, I don't like going overboard with the specifics, also i've grown quite accustomed to not using legendary/high grade/whatever you wish to call them pokemon, and prefer not to use them as i believe they personally take the fun out of battling. Anyone can run into a battle with Latios, Jirachi and Terrakion, and thier likely going to win, but I feel that by doing that the challenge factor is null and void, and being able to beat teams that use said pokemon is alot more satisfying to me.
Changes in Bold.
I also don't have a sturdy leader (no pun intended) as thanks to the team check, it's impossible to have a solid lead now adays.

Jirachi@Leftovers
Ability:Serene Grace
Careful Nature (+SpDef,-SpAtk)
Evs:252 Hp, 224 SpDef, 32 Spe
-Stealth Rock
-Iron Head
-Body Slam
-Wish
After testing this thing along with Latios it is awsome, it sets up Stealth Rock so I don't have to cheat my other guys to do it, as well as offering Wish healing support which is nice, but thanks to it's ability it can occasionally paralyze incoming opponents allowing me to Iron Head them to death or use Wish to heal someone else in need. This pokemon has already proven to be a valuable player to my other pokemon with it's healing and paralysis powers, and in it's first run singled handledly crushed a Donphan, which is very impressive.

Spinner
Starmie@Expert Belt
Ability: Natural Cure.
Timid nature(+Spe,-Atk)
Evs: 252 Spe, 252 SpA, 4 Hp
-Surf
-Ice Beam
-Thunderbolt
-Rapid Spin
Standard spinning Starmie, all of the moves offer extensive type coverage as well as STAB on HP, Rapid Spin is there for getting rid of opposing obsticle threats like spikes and rocks, covers Infernape well and helps cover the steel types as well. This pokemon helps ward off fighting pokemon as well as ground pokemon, along with Infernape and Lucario it's one of the triad which carried me through the fourth gen and i don't want to replace it. the Expert Belt works well enough on Starmie, providing it the power it needs without resorting to using another life orb.

Offensive Force
Lucario@ Life Orb
Ability:Justified.
Adamant Nature(+Atk,-SpA)
Evs: 252 Spe. 252 Atk, 4 hp
-Swords Dance
-Close Combat
-Crunch
-Extremespeed
Lucario is one of my favorite pokemon and it fits right at home here, even with out swords dance boost it can use it's other moves effectively for clean up duty as well as catching opponents in a switch and inflicting pain on them with STAB Close Combat, Extremespeed helps pick off weakened threats, and Crunch is there to deal with opposing psychic's and Jellicent. Lucario along with Scizor help Protect Dragonite and Hydreigon from threats and vice versa. This pokemon along with Infernape and Starmie carried me through the fourth gen well, and i would rather not get rid of them.

Old Reilable.
Infernape@Life Orb
Ability: Blaze
Naive Nature(+Spe,-SpDef)
EVs:252 Spe, 252 Atk, 4 SpAtk.
-Mach Punch
-Overheat.
-Close Combat
-Stone Edge.
Even though i've had to resort to using it differently this gen than the last one, Infernape continues to be one of my prime fighters, Close Combat hits hard with STAB and thanks to the life orb boost kills anything weak to fighting. Stone Edge is there to deal with flying pokemon as well as the occasional Volcorana that might appear in my way, Overheat is my fire move, and while yes it is basically a one shot, it can get the job done with that shot, as if a pokemon lives with sturdy they won't be living too long when something else hits the feild or I get them next turn, Mach Punch is the final move on this set, originally I had it for Excadrill, but now that Terrakion is running on alot of teams I feel it necessary to have counter measures to deal with the bull. This pokemon like Lucario and Scizor helps cover for the dragons and starmie against the types that beat em, and like Starmie and Lucario I consider it a core member of my team.

Trickster Dragon.
Latios@Choice Scarf
Ability:Levitate
Timid Nature(+Spe, -Atk)
Evs: 252 Spe, 252 SpAtk, 4 Hp
-Draco Meteor
-Psyshock
-Surf
-Trick
Not only is this thing fast, but with Trick it can cripple opposing pokemon by tricking the scarf onto them, and combos well with jirachi who can then body slam said pokemon into paralysis thereby making them wearing the scarf useless, Draco Meteor hits for massive pain, as does Psyshock which thanks to STAB, Surf hits a good deal of pokemon as well, and Trick is just plain awsome to use when done correctly, but if not it can outrun high speedsters and knock em senseless.

LGS (Late Game Sweeper)
Dragonite@Lum Berry
Ability:Multiscale
Adamant Nature (+Atk,-SpAtk)
Evs: 252 Atk, 252 Spe, 4 Hp
-Extremespeed
-Dragon Dance
-Fire Punch
-Outrage/Dragon Claw.
Generally comes in last (or goes first depending on what the opponent has), but there are times I won't hesistate to send him out first if the opposing team presents a problem to his ability, Dragon Dance is there for boosting which is generally followed by Outrage to rip through most of his opposition, Fire Punch helps deal with most steel types (outside of Heatran) and Extremespeed helps pick off weakened opponents like Lucario who he helps protect, though sometimes I wonder if Dragon Claw is a better choice as being locked down can be a drawback at times.
I'm not gonna lie, this team may not be the best in most eyes, but it's been good to me so far, getting more wins than losses, the pokemon cover for each other type wise and my style is extreme hyper offense (I don't care much for setting up entry hazards nor do I fear Toxic Spikes (since only one team member is effected by it that being Infernape, sure Starmie can get poisoned but upon withdrawl it is healed), go in and attack as quickly and hard as one can, the simplest method in my mind. Go in and win or lose trying by brute force.
I can't generalize my weaknesses (by pokemon anyway) cause i'm not smart like most of the people on this site, though I know some people have said I have a weakness to rain dance teams (even though type wise that isn't the case, but I see what thier getting at in terms of bulky pokemon) however in weather terms i fear Sunny day more as for why I mentioned in the beginning, why Venusaur isn't being suspect checked I have no idea since it's the second coming of Excadrill but I digress, and the overeliance of Priority probably isn't good sometimes, but it definitely makes up for disadvantages in speed based fights.
this is my team, please help me here.
Changes in Bold.
I also don't have a sturdy leader (no pun intended) as thanks to the team check, it's impossible to have a solid lead now adays.

Jirachi@Leftovers
Ability:Serene Grace
Careful Nature (+SpDef,-SpAtk)
Evs:252 Hp, 224 SpDef, 32 Spe
-Stealth Rock
-Iron Head
-Body Slam
-Wish
After testing this thing along with Latios it is awsome, it sets up Stealth Rock so I don't have to cheat my other guys to do it, as well as offering Wish healing support which is nice, but thanks to it's ability it can occasionally paralyze incoming opponents allowing me to Iron Head them to death or use Wish to heal someone else in need. This pokemon has already proven to be a valuable player to my other pokemon with it's healing and paralysis powers, and in it's first run singled handledly crushed a Donphan, which is very impressive.

Spinner
Starmie@Expert Belt
Ability: Natural Cure.
Timid nature(+Spe,-Atk)
Evs: 252 Spe, 252 SpA, 4 Hp
-Surf
-Ice Beam
-Thunderbolt
-Rapid Spin
Standard spinning Starmie, all of the moves offer extensive type coverage as well as STAB on HP, Rapid Spin is there for getting rid of opposing obsticle threats like spikes and rocks, covers Infernape well and helps cover the steel types as well. This pokemon helps ward off fighting pokemon as well as ground pokemon, along with Infernape and Lucario it's one of the triad which carried me through the fourth gen and i don't want to replace it. the Expert Belt works well enough on Starmie, providing it the power it needs without resorting to using another life orb.

Offensive Force
Lucario@ Life Orb
Ability:Justified.
Adamant Nature(+Atk,-SpA)
Evs: 252 Spe. 252 Atk, 4 hp
-Swords Dance
-Close Combat
-Crunch
-Extremespeed
Lucario is one of my favorite pokemon and it fits right at home here, even with out swords dance boost it can use it's other moves effectively for clean up duty as well as catching opponents in a switch and inflicting pain on them with STAB Close Combat, Extremespeed helps pick off weakened threats, and Crunch is there to deal with opposing psychic's and Jellicent. Lucario along with Scizor help Protect Dragonite and Hydreigon from threats and vice versa. This pokemon along with Infernape and Starmie carried me through the fourth gen well, and i would rather not get rid of them.

Old Reilable.
Infernape@Life Orb
Ability: Blaze
Naive Nature(+Spe,-SpDef)
EVs:252 Spe, 252 Atk, 4 SpAtk.
-Mach Punch
-Overheat.
-Close Combat
-Stone Edge.
Even though i've had to resort to using it differently this gen than the last one, Infernape continues to be one of my prime fighters, Close Combat hits hard with STAB and thanks to the life orb boost kills anything weak to fighting. Stone Edge is there to deal with flying pokemon as well as the occasional Volcorana that might appear in my way, Overheat is my fire move, and while yes it is basically a one shot, it can get the job done with that shot, as if a pokemon lives with sturdy they won't be living too long when something else hits the feild or I get them next turn, Mach Punch is the final move on this set, originally I had it for Excadrill, but now that Terrakion is running on alot of teams I feel it necessary to have counter measures to deal with the bull. This pokemon like Lucario and Scizor helps cover for the dragons and starmie against the types that beat em, and like Starmie and Lucario I consider it a core member of my team.

Trickster Dragon.
Latios@Choice Scarf
Ability:Levitate
Timid Nature(+Spe, -Atk)
Evs: 252 Spe, 252 SpAtk, 4 Hp
-Draco Meteor
-Psyshock
-Surf
-Trick
Not only is this thing fast, but with Trick it can cripple opposing pokemon by tricking the scarf onto them, and combos well with jirachi who can then body slam said pokemon into paralysis thereby making them wearing the scarf useless, Draco Meteor hits for massive pain, as does Psyshock which thanks to STAB, Surf hits a good deal of pokemon as well, and Trick is just plain awsome to use when done correctly, but if not it can outrun high speedsters and knock em senseless.

LGS (Late Game Sweeper)
Dragonite@Lum Berry
Ability:Multiscale
Adamant Nature (+Atk,-SpAtk)
Evs: 252 Atk, 252 Spe, 4 Hp
-Extremespeed
-Dragon Dance
-Fire Punch
-Outrage/Dragon Claw.
Generally comes in last (or goes first depending on what the opponent has), but there are times I won't hesistate to send him out first if the opposing team presents a problem to his ability, Dragon Dance is there for boosting which is generally followed by Outrage to rip through most of his opposition, Fire Punch helps deal with most steel types (outside of Heatran) and Extremespeed helps pick off weakened opponents like Lucario who he helps protect, though sometimes I wonder if Dragon Claw is a better choice as being locked down can be a drawback at times.
I'm not gonna lie, this team may not be the best in most eyes, but it's been good to me so far, getting more wins than losses, the pokemon cover for each other type wise and my style is extreme hyper offense (I don't care much for setting up entry hazards nor do I fear Toxic Spikes (since only one team member is effected by it that being Infernape, sure Starmie can get poisoned but upon withdrawl it is healed), go in and attack as quickly and hard as one can, the simplest method in my mind. Go in and win or lose trying by brute force.
I can't generalize my weaknesses (by pokemon anyway) cause i'm not smart like most of the people on this site, though I know some people have said I have a weakness to rain dance teams (even though type wise that isn't the case, but I see what thier getting at in terms of bulky pokemon) however in weather terms i fear Sunny day more as for why I mentioned in the beginning, why Venusaur isn't being suspect checked I have no idea since it's the second coming of Excadrill but I digress, and the overeliance of Priority probably isn't good sometimes, but it definitely makes up for disadvantages in speed based fights.
this is my team, please help me here.