Pokemon white first wifi team.

This is my white version team when I have time to get it. Right now I'm busy and I have to take care of my baby. Let me know if I need to change anything.

Samurott
Nature: Adamant
EV: 252 Atk, 252 SpE

Waterfall
Megahorn
Sword dance
Dragon tail
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Sawk
Nature: Adamant
EV: 252 atk, SPE 252

close combat
Earthquake
payback
posion jab
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Krookodile
Nature: Adamant
EV: 252 Atk, SPE 252

crunch
earthquake
Shadow claw
low sweep
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Cofagrigus
Nature: modest
Ev: 252 spa, 252 spe

confuse ray
fireblast
shadowball
painsplit
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hydreigon
nature: modest
Ev: 252 SPA, 252 spe

Tri attack
Dragon puse
work up
charge beam

I know I'm boring all my pokemon are adamant and modest. These are the only nature I got used to right now. I do use others sometimes depends on what I want for that pokemon.

Samurott: You can use Aqua Jet or Encore over Dragon Tail; the former for priority and the latter to help open up opportunities to Swords Dance.

Sawk: Replace Poison Jab with Rock Slide or Stone Edge; Poison has terrible coverage.

Krookodile: Low Sweep and Shadow Claw are redundant with your STABs. Use Stone Edge/ Rock Slide and Dragon Claw/Outrage instead.

I think you meant Chandelure, since Cofagrigus can't use Fire Blast. Use Substitute and Calm Mind in place of Confuse Ray and Pain Split.Also, make it Timid.

Hydreigon is terrible. Your current set isn't making the most of its huge movepool; use this one:
-Draco Meteor/Dragon Pulse
-Fire Blast
-Focus Blast
-U-turn/Surf
Nature: Timid/Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf

Or, if you're intent on keeping Work Up:
-Work Up
-Crunch
-Dragon Pulse
-Earthquake/Fire Blast
Nature: Naive
EVs: 64 Atk/252 SAtk/192 Spe
Item: Life Orb