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Nosepass - Rock / Steel
Base Stats: 60 / 55 / 145 / 75 / 150 / 40
Sturdy: The Pokémon survives at 1 HP by moves that KO it when at full HP.
The only moves you need-
HGSS Move Tutor:
Pain Split
Magic Coat
HGSS or BW TMs:
Protect
Taunt
Toxic
Torment
Level up a Nosepass from HGSS in Mt Coronet, make it lvl 2 and it'll evolve! When you do, you will have yourself a Pokemon that can last forever, as long as your foe doesn't use Substitute or have really low HP, (and remember with a Level 2, base 60 HP, that wont be a problem for Probopass most of the time).
There are a lot of reasons this Pokemon makes a great Sturdy user.
Here is a propossed Probopass set, remember, prediction is key, especially with Magic Coat. I put in Bold the reason for each choice of item, EVs, IVs and moves
Set Name: Pain Stall
Probopass: @ Leftovers [Hail / Stealth Rock negation]
Ability: Sturdy
EVs, & IVs: 0, & 0. [Probopass has 14 HP; 1 layer of Spikes/Leech Seed/Burn = 1 damage not 2 so it's negated by Leftovers without Protect. 5 Speed =Trick Room abuse]
Nature: (+ SpA, -Spe) [Trick Room ulities]
~Magic Coat [Reflects: Leech Seed, W-o-w, Swagger, etc.]
~Pain Split [Hurts foes, heals user; keeps Sturdy active]
~Protect / Toxic [Protect scouts and stalls for free Leftovers which helps vs Stealth Rocks; Toxic causes damage and switches]
~Torment / Taunt [Torment handles Choiced foes, especially with Protect; Taunt is Anti-Heal, Whirlwind, Roar, Trick Room, etc.]
[Commentary]
This set is meant to be abused on a Sandstream team with Toxic Spikes. The reason is Sandstream adds damage to the foe, as does Toxic Spikes, while Probopass can infinitely stall out foes thanks to Pain Split and Sturdy. Not only does Pain Split + Sturdy pretty much halve an opponent's HP the first time it is used, but it helps to quickly wear down foes that are being hit through their own Life Orb, plus Sandstorm, and/or Toxic Spikes. Sandstream Pokemon like Hippowdon also negate Hail, which can be problematic for Probopass. While he can survive an Attack at 1 HP, and use Pain Split to heal back up to full HP, and Hail's damage is negated by Leftovers, keep in mind that if the foe uses an attack and you mispredict and use Magic Coat, you will survive the hit at 1 HP, but Hail will finish you off. Use Probopass with a Sandstreamer so that if you mispredict, you're Probopass will survive at 1 HP, but can be saved for fodder later on (or switch in on something safe, like using Leech Seed on a foe then switching Probopass on say Toxic, healing him back to full health.) Sandstream also prevents Hail from negating his Leftovers if the foe set up Stealth Rock, you don't ever want Probopass below 100% health or else Sturdy wont save him.
If used to good prediction, this Probopass can truly stall against foes. Pack Sandstream, probably a spinner, and at least Toxic Spikes of your own. Hey, that pretty much means Hippowdon and Forretress.
With Magic Coat's priority, Probopass will be able to negate indirect damage back at the user even though he is very slow, meaning if the foe is not Immune to their own attacks (such as a Ghost using W-o-w), they will be hurt, and less likely to use that attack again. Taunt is to be used after Toxic, so you can Toxic a foe while it isn't attacking, then Taunt them the following turn; this way you Pain Split them while Toxic weakens them, while they are forced to either switch or continue attacking while you stay alive through Pain Split + Sturdy, the ultimate stall).
Pain Split is really what allows Probopass to do what it does- keep Probopass alive by reactivating Sturdy; also cuts foes HP by 50% each use. Just ensure you have good prediction with this set, as you don't want to Pain Split when they W-o-w, you want to have Magic Coat used at the right time.
http://www.serebii.net/pokedex-dp/476.shtml

Nosepass - Rock / Steel
Base Stats: 60 / 55 / 145 / 75 / 150 / 40
Sturdy: The Pokémon survives at 1 HP by moves that KO it when at full HP.
The only moves you need-
HGSS Move Tutor:
Pain Split
Magic Coat
HGSS or BW TMs:
Protect
Taunt
Toxic
Torment
Level up a Nosepass from HGSS in Mt Coronet, make it lvl 2 and it'll evolve! When you do, you will have yourself a Pokemon that can last forever, as long as your foe doesn't use Substitute or have really low HP, (and remember with a Level 2, base 60 HP, that wont be a problem for Probopass most of the time).
There are a lot of reasons this Pokemon makes a great Sturdy user.
- Immune to Poison, Toxic Spikes, and Sandstorm. When you are vying to survive an attack over and over at 1 HP, you don't want status or weather damage to get in the way. While Leftovers and Magic Coat can negate Hail and Burn, having an Immunity to the more common Sandstorm and Toxic Spikes really makes Sturdy abuseable.
- Resistance to Stealth Rock allows Probopass to negate the damage it takes switching in with Leftovers. While you must be careful to only switch in on a move that doesn't damage Probopass either directly or indirectly (such as Toxic, or Wish), you can maintain Probopass' essential 100% HP through Leftovers, meaning you can still use him without a Rapid Spinner. Say you have a Vaporeon to Baton Pass Substitutes.
- Access to Pain Split is what makes Probopass a useful ally to your team. Not only does it keep Probopass at such perfect HP due to it being only Level 2 versus Level 100 enemies, but it ensures it deals damage to your foe especially as Probopass survives a hit at 1 HP, and then divides your foe's 100% health Pokemon by about 50%. Not to mention any Life Orb, and hopefully Sandstream and Toxic (Spikes) damage racking up. Pain Split does good damage while almost healing unless Substitute or Taunt is used by the foe. While Toxic's advantage is that Probopass can still Pain Split a foe at 24% HP to stall, as Toxic kills it that turn. This means even at low HP Probopass can fully heal, and Toxic's build up of damage means your foe wont be at 5% before it dies, securing Probopass' Pain Split always refreshes Sturdy.
- Access to Magic Coat allows Probopass to maintain it is not only able to stop Status moves like Sleep and Burn, but always go first, allowing it to be at Level 2, and maintain its strategy. Magic Coat, unlike Safeguard, also has the benefit of sending back a Status condition that a foe targets you with, punishing possible enemies with their own attack, all the while keeping Probopass Status free, and probably letting them know they need to either switch or outpredict you. This allows you to Toxic their switch-in, or Pain Split them as they attack, all the while stalling as the Sandstorm, Poison, and possibly Life Orb damage adds up.
- Probopass requires very good prediction skills to be used. You want to Magic Coat when you predict a Status move like W-o-w, or an indirect damaging move like Leech Seed, or a move that can both damage and prevent you from carrying out your moves like Swagger. Probopass can really last as long as you want it to, just make sure you watch out for certain moves like Substitute which prevents Pain Split from working. However, if you manage to predict a Substitute Pokemon switching in, or think you can Taunt them the turn before they use Substitute, that's exactly why Probopass is packing Taunt. Taunt can force switches (opportunities to use Toxic on switch-ins), and forces foes to attack you, not only ensuring you don't have to predict as much (Attackers are just going to get Pain Split as you stall their Sandstream and Toxic damage) but it also means that foes like Blissey won't be able to use Wish to aid their allies, plus with such a low HP % remaining after Pain Split and Toxic, Sandstream's residual damage alone should be enough to KO her and other high HP walls that may otherwise cause you trouble as soon as the turn is over.
Here is a propossed Probopass set, remember, prediction is key, especially with Magic Coat. I put in Bold the reason for each choice of item, EVs, IVs and moves
Set Name: Pain Stall
Probopass: @ Leftovers [Hail / Stealth Rock negation]
Ability: Sturdy
EVs, & IVs: 0, & 0. [Probopass has 14 HP; 1 layer of Spikes/Leech Seed/Burn = 1 damage not 2 so it's negated by Leftovers without Protect. 5 Speed =Trick Room abuse]
Nature: (+ SpA, -Spe) [Trick Room ulities]
~Magic Coat [Reflects: Leech Seed, W-o-w, Swagger, etc.]
~Pain Split [Hurts foes, heals user; keeps Sturdy active]
~Protect / Toxic [Protect scouts and stalls for free Leftovers which helps vs Stealth Rocks; Toxic causes damage and switches]
~Torment / Taunt [Torment handles Choiced foes, especially with Protect; Taunt is Anti-Heal, Whirlwind, Roar, Trick Room, etc.]
[Commentary]
This set is meant to be abused on a Sandstream team with Toxic Spikes. The reason is Sandstream adds damage to the foe, as does Toxic Spikes, while Probopass can infinitely stall out foes thanks to Pain Split and Sturdy. Not only does Pain Split + Sturdy pretty much halve an opponent's HP the first time it is used, but it helps to quickly wear down foes that are being hit through their own Life Orb, plus Sandstorm, and/or Toxic Spikes. Sandstream Pokemon like Hippowdon also negate Hail, which can be problematic for Probopass. While he can survive an Attack at 1 HP, and use Pain Split to heal back up to full HP, and Hail's damage is negated by Leftovers, keep in mind that if the foe uses an attack and you mispredict and use Magic Coat, you will survive the hit at 1 HP, but Hail will finish you off. Use Probopass with a Sandstreamer so that if you mispredict, you're Probopass will survive at 1 HP, but can be saved for fodder later on (or switch in on something safe, like using Leech Seed on a foe then switching Probopass on say Toxic, healing him back to full health.) Sandstream also prevents Hail from negating his Leftovers if the foe set up Stealth Rock, you don't ever want Probopass below 100% health or else Sturdy wont save him.
If used to good prediction, this Probopass can truly stall against foes. Pack Sandstream, probably a spinner, and at least Toxic Spikes of your own. Hey, that pretty much means Hippowdon and Forretress.
With Magic Coat's priority, Probopass will be able to negate indirect damage back at the user even though he is very slow, meaning if the foe is not Immune to their own attacks (such as a Ghost using W-o-w), they will be hurt, and less likely to use that attack again. Taunt is to be used after Toxic, so you can Toxic a foe while it isn't attacking, then Taunt them the following turn; this way you Pain Split them while Toxic weakens them, while they are forced to either switch or continue attacking while you stay alive through Pain Split + Sturdy, the ultimate stall).
Pain Split is really what allows Probopass to do what it does- keep Probopass alive by reactivating Sturdy; also cuts foes HP by 50% each use. Just ensure you have good prediction with this set, as you don't want to Pain Split when they W-o-w, you want to have Magic Coat used at the right time.