the best stallbreakers in nu?
I've had great success with:

Uxie @ Leftovers
Ability: Levitate
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
- Substitute
- Calm Mind
- Psyshock
- Signal Beam / Giga Drain
Do NOT switch on a status ailment or Leech Seed, that's the last thing you want; a crippled Uxie. Even para is a nuisance.
This beast's Substitutes has the bulk to take uninvested Knock Offs from Lickilicky, and Giga Drains from Vileplume. After a Calm Mind it'll sponge many Life Orb special attacks.
Signal Beams hurts psychic and dark types like Musharana, Mesprit, Cacturne and Malamar.
Giga Drain hits those bulky grounds who eat Psyshocks like Rhydon, Mega Steelix and Golem while offering recovery.

Mismagius @ Life Orb
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Nasty Plot
- Substitute
- Shadow Ball
- Dazzling Gleam / Thunderbolt
Pretty cool against stall and in general but struggles against Calm Mind Mega Audino.
Thunderbolt lets you hit Pyroar and Mantine, Dazzling Gleam hits Hariyama and dark types. HP Fighting sounds like it'll be ok, but is piss weak against what it attacks neutrally like Mega Audino and Murkrow.