Planned Wifi Team

[Nineray]

So I've been planning to play online for a while and i've made my team before, but I just need help editing it. I've tested this team with friends and I haven't lost yet, but my friends aren't that good so I'm not sure if I'd do remotely well online.

Thundurus-T-Electric Gem-Jolly Volt Absorb
Focus Blast
Nasty Plot
Thunderbolt
Dark Pulse

Blaziken Life Orb Adamant Speed Boost
Sky Uppercut
High Jump Kick
Shadow Claw
Flare Blitz

Ferrothorn Rocky Helmet Lax Iron Barbs (Speed IV=0, i now hate breeding with a passion)
Power Whip
Wood Hammer
Gyro Ball
Iron Defense

Starmie Choice Scarf Timid Natural Cure
Thunderbolt
Psychic
Ice Beam
Hydro Pump

Haxourus Dragon Gem Impish Mold Breaker
Outrage
Dragon Dance
Dragon Claw
Superpower

Mamoswine Ice Gem Adamant Snow Cloak
Icicle Crash
Earthquake
Superpower
Ice Shard

How do you think this team would hold up online and how are the moves on my Pokemon?

 

[PlatinumDude]

I'm assuming Gen V, as some Pokemon aren't available in X/Y. I'm afraid you'll need to re-breed some of your Pokemon, as painful as it sounds. EVs would totally be appreciated too.

Jolly is a terrible nature for Therian Thundurus. Timid is the superior nature in every case:
-Nasty Plot
-Thunderbolt
-Hidden Power (Ice)
-Focus Blast/Grass Knot/Substitute/Agility
Nature: Timid/Modest
EVs: 4 Def/252 SAtk/252 Spe (Timid) or 128 HP/252 SAtk/128 Spe (Modest)
Item: Life Orb

or
-Agility
-Thunderbolt
-Hidden Power (Ice)
-Grass Knot/Focus Blast
Nature: Modest
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb

or
-Thunderbolt
-Hidden Power (Ice)
-U-turn
-Superpower/Grass Knot
Nature: Naive
EVs: 4 Atk/252 SAtk/252 Spe
Item: Expert Belt

or
-Thunderbolt
-Hidden Power (Ice/Flying)
-Focus Blast
-U-turn/Volt Switch
Nature: Naive/Timid
EVs: 4 Atk/252 SAtk/252 Spe
Item: Choice Scarf

Blaziken can get away with just Flare Blitz and Hi Jump Kick, as they're stupidly powerful and can dent even resists:
-Swords Dance
-Flare Blitz
-Hi Jump Kick
-Protect
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Leftovers/Life Orb
Ability: Speed Boost

Iron Defense isn't worth using on Ferrothorn because it's massive setup bait. An entry hazard must be used if it wants to make use of its support move pool. No it can't learn Wood Hammer:
-Spikes/Stealth Rock
-Leech Seed/Stealth Rock
-Power Whip/Protect
-Gyro Ball/Thunder Wave
Nature: Relaxed
EVs: 252 HP/48 Def/208 SDef
Item: Leftovers

Starmie should use Trick over Psychic to cripple walls. If a wall comes in and Starmie hasn't used a move yet, you can just Trick the Choice Scarf away.

Impish is a waste of Haxorus' offensive capabilities. It's not the defensive kind of Pokemon, as it's somewhat frail:
-Dragon Dance
-Outrage
-Earthquake
-Low Kick/Taunt
Nature: Jolly/Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Lum Berry/Yache Berry
Ability: Mold Breaker

Thick Fat is still Mamoswine's preferred ability.

 

[Boilurn]

If this is Gen. 5, it's also worth noting that five out of six Pokemon you have are in the OU tier. The only one that isn't is Blaziken, as he is banned from OU for some reason. Infernape is a very similar alternative if you want a Pokemon with a similar typing, or you could choose Sharpedo, who has a different typing, but still has the wonderful Speed Boost ability.