This is my BT team:

Gengar @ Focus Sash
Modest 255 Sp.Atk, 255 Spd
Shadow Ball
Thunderbolt
Focus Blast
Destiny Bond

Salamance @ ???
Adamant 255 Atk, 255 Spd
Fly
Brick Break
Earthquake
Dragon Rush

Milotic @ ???
Calm 255 Sp.Atk, 255 Sp.Def
Surf
Ice Beam
Recover
Dragon Pulse

(usually I put any items on Salamance and Milotic)

So far this has been great but I'm a little nervous about beating the battle tower for the fifth time in a row i barely made it out on my fourth. So i tried to practice in the Wi-Fi Battle Room and i was only able to beat 1 challenge and in the rest of my tries i got pretty far but ended up losing. Gengar is definetly the best on my team it does most of the work and if not all, most of the time, so i don't want to replace him. But I'm thinking about replacing Salamance and/or Milotic or just giving them a useful item or something. Any suggestions?

i will unfortunately recommend retraining salamence
Dragon dance is a must
my milotic works great like this:
modest
252 sp a, 129 d, 129 sp d
rest
sleep talk
surf
dragon pulse
since nobody uses empolon, it has not resistances

Give Salamence Choice Band, and replace Fly with Aerial Ace. You may want to replace Dragon Rush with Dragon Claw, for the accuracy. (You can also go with DDmence too, but that requires a totally new poke)

Milotic should have Leftovers. You can replace Ice Beam or Dragon Pulse with Toxic/Hypnosis, or use the RestTalk set posted by Last Redeemer.

if u have a lot of time u can stall w/ toxic ono milotic cuz it wont die, but thats if u r willing to sit around and watch something slowy die of toxic

Thanks.

I like using OHKO moves in the battle tower. No, Im not talking about sheer cold.

This OHKO metagross has done me wonders.

Metagross @ life orb
adamant 252 atk 252 spd 4 def
explosion
meteor mash
earthquake
agility

agility first, PWN thier team, then explode on anything you cant beat, exept ghosts. that would suck. another great option is latios. I luvs ma latios. give it soul dew (available on PBR) and a decent moveset and...well it rocks.

Latios @ soul dew
252 sp atk 252 speed 4 sp def
draco meteor/dragon pulse
grass knot/energy ball/focus blast
thunderbolt/thunder
shadow ball (Im not sure id it learns dark pulse)

Its hard to find a good natured latios (timid/modest) so as long as the nature doesnt decreas sp atk, sp def, or speed your fine.

PS latias works too.

That sounds like a great idea but do u know which pokemon in my team should i replace with the metagross.

replace salamence with metagross and replace milotic with lati@s, if you can get one.

Heres my BT team ( i just signed up today so...if i do somem wrong dont get mad)

Sceptile @ ???

Leaf Blade
Solar Beam
X Scissor
Giga Drain

Arcanine @ ???
Extreme Speed
Arial Ace
Fire Blast
Flamethrower

Gyarados
Dragon Dance
Earthquake
Waterfall
Thunder Bolt

So..ya like it ?

Yeah its good but i think you should replace your Gyrados's waterfall for surf its a bit more powerful.