I'll post a Frontier Brain Team. The one in my sig, of course. And with Ev's, Items, natures, and movesets.
The facility would be the standard 7 battle rounds, with an added challenge: Your Pokemon cannot be healed between the battles, like the Battle Castle, only without the option to buy it, the only things that work are the moves and items the Pokemon themselves have. This tests the challenger's will to win. The opponents Pokemon are made slightly weaker to compensate for this.
Before you face the Frontier Brain, your Pokemon will be healed to make it fair, however.
Skarmory@Focus Sash
Careful
Ev's:200Hp/200Sp.Def/108Def
-Drill Peck
-Roost
-Stealth Rock
-Whirlwind
Venusaur@Black Sludge
Bold
Ev's:200Hp/160Def/148Sp.Def
-Giga Drain
-HP Fire
-Substitute
-Leech Seed
Rhyperior@Leftovers
Jolly
Solid Rock
66 HP/252 Atk/192Spe
-Rock Slide
-Earthquake
-Aqua Tail
-Rock Polish
The first round team, you face it after 20 wins. Skarmory sets up Stealth Rock, then begins using Whirlwind to hurl your team around and cause them damage. He uses Roost to stick around, then uses Drill Peck to cause damage at every opportunity. Venusaur comes next. He uses Substitute to protect himself, then sets up Leech Seed to sap health he can use for more Substitutes. Giga Drain augments that, and Fire TypeHidden Power covers his weaknesses. Rhyperior comes out, by which point you have to get really lucky to beat him. Rock Polish lets him outspeed all non-Choice Scarfed Base 115's after just one, and then he tears his opponents to pieces. Basically, status is the only way to win, but status users are going to run out quickly in the battles before you face the Frontier Brain.
Latias@Light Clay
Bold
Ev's:252Hp/236Def/20Sp.Def
-Light Screen
-Reflect
-Recover
-Dragon Pulse
Suicune@Leftovers
Bold Nature
EVs:252 Hp/252 Def/4Sp.Atk
-Calm Mind
-Surf
-HP Electric
-Ice Beam
Umbreon@Shell Bell
Impish
Ev's:252Hp/252Sp.Def/4Atk
-Payback
-Wish
-Curse
-Toxic
This is my ultimate team, and you face it after 48 wins. Latias starts off, and uses Light Screen and Reflect to cut down on damage. She is bulky enough to stick around forever, and with Recover, all she has to do is Dragon Pulse until she runs out, then Recover until the Screens wear off, then set up the Screens again and switch out. Suicune comes next and uses the Screens to help him set up Calm Mind, making him almost Blissey-like at absorbing Special Attacks, and gives him Special Attack pwoer beyond belief. Sweeps with Surf, Ice Beam, and Electric Type Hidden Power. He might switch out to Latias so the Screens come back up. Umbreon is the team healer, and he uses Curse to bulk up defensively and offensively, and cut his speed for Payback. He also uses Toxic, just to make it harder on you
Latias will usually pop out to set up the Screens again before he comes out. He's also the team healer, with Wish so he can switch out to a resonably healthy Latias or Suicune, and then restore their Hp a turn later. Once again, Status is key, but the same danger applies, with an added twist. Suicune has the Preassure Ability, and this means he costs you double the PP you'd normally use. Once you're forced to use Struggle, you're doomed. MWAHAHAHAHA!
Yeah, this took a while
Oh, and before you ask, they are all truly shiny
Also, the steel type team on this thread is the exact same members for my Steel Type team on the old thread for this in Pokepolls some three months ago.