Need help on building my OU team

[Adryel]

I just bought my router and playing Pokemon B/W wifi battle was fun
but after getting a lot of loosing streaks i think i have a problem on my OU team anyways here's my team

Salamence
EV: 252 Atk / 4 SpA / 252 Spe
Item: Life Orb
Nature: Naive
Ability: Intimidate
Moves:
~ Dragon Dance
~ Outrage
~ Earthquake
~ Fire Blast

Tryranitar
EV: 252 Atk / 4 Def / 252 Spe
Item: Life Orb
Nature: Adamant
Ability: Sandforce
Moves:
~ Dragon Dance
~ Fire Punch
~ Crunch
~ Stone Edge

Jirachi
EV: 252 Atk / 4 HP / 252 Spe
Item: Leftovers
Nature: Jolly
Ability: Serene Grace
Moves:
~ Substitute
~ Thunder Wave
~ Iron Head
~ U-Turn

Sceptile
EV: 252 SpA / 28 SpD / 228 Spe
Item: Leftovers
Nature: Timid
Ability: Overgrow
Moves:
~ Substitute
~ Leech Seed
~ Giga Drain
~ Hidden Power Fire

The other 2 is Blaziken and Groudon and i need a replacement for those 2 because they are Uber D:

Need help thx :)

 

[PlatinumDude]

While Sceptile can do kinda well in OU, it's somewhat frail and it can easily be revenged by Scizor. Ferrothorn can pull off a similar job that Sceptile does, only that it's slower. If you want to keep Sceptile, that's fine:
-Stealth Rock/Spikes
-Leech Seed
-Power Whip/Protect
-Gyro Ball/Thunder Wave/Protect
Nature: Relaxed
EVs: 252 HP/88 Def/168 SDef
Item: Leftovers

Infernape is a non-Uber alternative to Blaziken. It's faster too:
-Overheat/Fire Blast
-Close Combat
-Grass Knot/U-turn
-Stone Edge/Mach Punch
Nature: Hasty/Naive
EVs: 252 Atk/4 SAtk/252 Spe
Item: Life Orb

Just to give Ferrothorn a bulky Water Pokemon to work with (since it works well with most Water Pokemon), you can go for Jellicent (for spinblocking) or Starmie (for fast sweeping):
Jellicent:
-Scald/Surf
-Toxic/Will-o-Wisp
-Recover
-Taunt
Nature: Bold
EVs: 248 HP/216 Def/44 Spe
Item: Leftovers

or
-Scald/Surf
-Shadow Ball/Ice Beam
-Toxic/Will-o-Wisp
-Recover
Nature: Calm
EVs: 252 HP/36 Def/220 SDef
Item: Leftovers
Ability: Water Absorb

Starmie:
-Hydro Pump/Surf
-Ice Beam
-Thunderbolt
-Rapid Spin/Recover
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Leftovers/Life Orb
Ability: Natural Cure

or
-Surf/Hydro Pump
-Ice Beam
-Thunderbolt
-Trick/Psyshock
Nature: Timid
EVs 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf
Ability: Natural Cure