Breloom @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP, 252 Speed, 4 Def
Nature: Jolly
- Leech Seed
- Substitute
- Spore
- Focus Punch
OR
Breloom @ Focus Sash
Ability: Technician
EVs: 252 Atk, 252 Speed, 4 HP
Nature: Jolly
- Spore
- Swords Dance
- Bullet Seed
- Mach Punch
The Sub Seed set sacrifices attack investment for a higher level of annoyance. Basically, drain your opponent's health to the extent where Poison Heal & Leech Seed are nearly recovering the health taken by your Substitute in turn.
OR
Techniloom. It's not a classic "Troll" set, but with one Swords Dance set up, it's amazingly hard to get rid of without a fast Pokemon or a priority move.
Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP, 128 Def, 128 Speed
Nature: Jolly
- Protect
- Substitute
- Toxic
- E-Quake/ Ice Fang
Ah. The classic Toxic stall. With Protect & Poison Heal, Gilscor can manage to replenish its health lost from making a Substitute in no time, and proceed to waste an opponent's PP. Due to spikes immunity and Stealth Rock neutrality, Gilscor has plenty of switch in opportunities in which to set up its stalling.
Walrein @ Leftovers
Ability: Ice Body
EVs: 252 HP, 252 Sp. Def, 4 Speed
Nature: Calm
- Substitute
- Protect
- Toxic
- Blizzard
This is the most annoying Hail staller. EVER. I HATE this stupid seal with a passion. Water/ Ice typing grants it only 2 resistance (to Water and Ice), but evens out that Steel & Fire weakness, and gives it STAB to deal with Grass & Rock types. The Stallrein set is basically recovers as much as Poison Heal recovers (1/8 of health) each turn with both Ice Body & Leftovers, while the opponent is buffetted by hail & taking Toxic poisoning.
Togekiss@ Leftovers
Ability: Serene Grace
EVs: 252 HP, 56 Def, 200 Sp. Def
Nature: Calm
- Thunder Wave
- Air Slash
- Roost
- Heal Bell
Jirachi isn't the only Pokemon capable of Paraflinching. With brilliant bulk, Togekiss is able to take quite a few hits in order to set up its Paraflinching. Heal Bell is there to cure yourself of anything with Synchronise.
Manaphy @ Leftovers
Ability: Hyration
EVs: 252 HP, 4 Sp. Atk, 252 Speed
Nature: Timid
- Calm Mind
- Rest
- Scald
- Ice Beam
Hydration means Rest is instant full recovery for Manaphy, in addition to being unable to be para flinched/ poisoned. Pure Water typing means it's got only 2 weaknesses and 4 resistances. Though Tail Glow seems much more appealing, so many Uber teams will carry Rain clearers like Thunder on Plakia, so Calm Mind will be able to stall out threats like Palkia/ Dialga which don't have STAB.
Suicune @ Leftovers
Ability: Pressure
EVs: 252 HP, 252 Def, 4 Sp. Def
Nature: Bold
- Calm Mind
- Rest
- Sleep Talk
- Scald
While I wish that Water Absorb was available for Suicune, Pressure is a really great stalling ability, since it means your opponent will run out of PP faster than usual. Calm Mind Suicune is pretty hard to get rid of without Hazers or something that can use Whirlwind/ Roar.
Alomomo @ Leftovers
Ability: Regenerator
EVs: 252 HP, 252 Def, 4 Atk
Nature: Impish
- Waterfall
- Protect
- Wish
- Toxic/ Refresh
This weird fish is basically a reverse Blissey. Monster HP Stat, useable base 80 defence, it's one of the best Wish passers in the lower tiers and can take hits like a sponge. Depending on what else is on your team, Toxic or Refresh will be better suited for Alomomola. If you already have something to Toxic Spike, then Refresh will be better.