The first impression on this team is that anything with Rock Slide and Earthquake can completely pwn it. This team needs some serious work over here.
Take out Rayquaza: you don't really need that many Dragon Dancers, and keep EITHER Salamence or Dragonite. Both of them are great Dragon Dancers, so pick just one. Adding Flygon and Milotic into your team helps a lot. Kingdra's an okay option as well.
Tyranitar@lefties
Adamant Nature
- Dragon Dance
- Earthquake
- Rock Slide
- Sub / T-Wave / Aerial Ace / Taunt
Substitute and T-Wave are good supportive moves ingame to stall the opponent while T-Tar Dragon Dances up. Taunt is the standard option, but it doesn't really help if your opponent just uses offensive moves. Aerial Ace is there if you're really afraid of Heracross or Breloom. Leave this thing for last once Kyogre is gone: this thing really hurts once it's set up.
Sceptile@lefties / Petaya Berry
Timid Nature
- Leaf Blade
- Sub
- Leech Seed
- T-Punch
Petaya helps Sceptile sweep hard once its health gets low enough with Substitute. With Leech Seed Sceptile can stall special walls like Blissey and Snorlax, unlike its pure special sweeping counterpart.
Salamence@Choice Band
Adamant Nature
- Earthquake
- Rock Slide
- Aerial Ace
- Fire Blast / Hydro Pump
Put this guy up as your first pokemon so you can scout the opponent's moves. If you still want Salamence as a Dragon Dancer replace Choice Band with lefties and Fire Blast / Hydro Pump with Dragon Dance. Hydro Pump is suggested if your brother is using a Drizzle team.
Dragonite@lefties
Lonely Nature
- Dragon Dance
- Earthquake
- Aerial Ace
- Thunder
A much sturdier Dragon Dancer than Salamence, too bad he doesn't learn Rock Slide till D/P. Thunder is there seeing your brother has a Kyogre in his team.
Dragonite@lefties
Quiet Nature
- T-Bolt
- Ice Beam
- Sub
- Focus Punch
Doesn't hit as hard as the DD version, but has a much wider line of fire. Nothing resists BoltBeam except for Lanturn, Magneton and Shedinja, and Focus Punch hits special walls like Blissey hard.
Rhydon@lefties
Adamant / Impish Nature
- Swords Dance
- Rock Slide
- Earthquake
- Megahorn / Double Edge
Always remember to have Rock Head as your trait or you'll be taking a crapload of damage from your own Double Edge, especially with Swords Dance. Or you could always go with the Choice Band set.
Rhydon@Choice Band
Adamant Nature
- Rock Slide
- Earthquake
- Megahorn
- Double Edge
I prefer Flygon better in a Dragon team though.
Flygon@lefties
Adamant Nature
- Earthquake
- Rock Slide
- Screech
- Quick Attack / Fire Blast
A physical sweeper with Screech discourages any attempts to stat up, especially if the sweeper in question can dish out STAB EQs. Quick Attack / Fire Blast are filler moves.
Milotic@lefties
Bold Nature
- Surf
- Ice Beam
- Rest
- Sleep Talk
Ah, ReSTalking Milotic. This thing absorbs attacks and status like nothing. Works really well with Marvel Scale. You'll find yourself loving this.
If you want a special sweeper that can benefit from the rain, use Kingdra.
Kingdra@lefties
Modest Nature
- Surf
- Ice Beam
- Rain Dance
- Toxic / Rest
Toxic is for other waters a.k.a. Kyogre. Rest is useful in general.
Whew that was a long post.