Altaria

Natural Cure
Cures status on switching out.
Type Tier
Dragon / Flying UU
Level 100 Statistics (see level 5, 50, 100)
Min- Min Max Max+
HP
75
- 291 354 -
Atk
70
158 176 239 262
Def
90
194 216 279 306
SpA
70
158 176 239 262
SpD
105
221 246 309 339
Spe
80
176 196 259 284

Overview

Natural Cure Rest is just awesome, and Altaria is the only thing that really gets to pull it off, since all other Pokemon with Natural Cure, even Corsola and Roselia, have Recover or some sort of recovery move. Thanks to Natural Cure, when Altaria uses Rest, it instantly wakes up after switching out. Its defensive stats are great, and it has the support moves to use them. That's why a set with more of a stalling mentality is recommended. However, the Dragon Dance set with Sing can really surprise people when you put their counter to sleep.

Name Item Nature

Staller

Leftovers Calm
Moveset EVs
~ Toxic / Hidden Power Grass
~ Fire Blast / Flamethrower
~ Haze / Perish Song / Sing
~ Rest
248 HP / 44 Def / 216 SpD

This is a semi-standard Altaria set for both versions of play. Toxic can be used with Altaria's defenses to stall the opponent out and then heal with Rest, while Flamethrower will hit anything that you can't hit with Toxic (namely, Steel- and Poison-types, especially since many Poisons have a part Grass typing). Hidden Power Grass can be used to hit Water-types in general and Quagsire in particular. Dragon Claw can be used as an attack for the "Flameclaw" combo, which nothing resists, but Dragon Claw really isn't going to be hurting much, so it's not recommended. Sing and Toxic don't make a very good combo, generally, so try and use that with Dragon Claw more often.

Name Item Nature

Dragon Dance

Leftovers Adamant
Moveset EVs
~ Dragon Dance
~ Hidden Power Flying
~ Earthquake
~ Rest / Fire Blast / Flamethrower
188 HP / 252 Atk / 44 Def / 24 Spe

Dragon Dancing Altaria set is pretty much an inferior Salamence, except that Altaria can Natural Rest and hit the road when it knows it's beaten. Put in a Fire-type move if you want to beat Skarmory, but I'd suggest sticking with Rest and just Natural Resting when big bad Skarmory comes in. Fortunately, Skarmory is not in the same metagame as Altaria, and thus won't be seen in Altaria's normal use (UU).

Other Options

Altaria gained Heal Bell with the XD moves, making it an even better supporter. It can come in to sponge a hit, Heal Bell to cure Toxics, Sleep Powders and whatnot, maybe Rest off any damage taken, and switch out to come back later.

EVs

For Dragon Dancing sets, keep Speed at the magic 200, focus a little bit on Attack, giving it an Adamant nature, even if you're using a Fire-type move, then dump the rest in HP and defenses. For a stalling set, you'll want to take advantage of Altaria's defenses, which are actually her best stats. Give her around 200 Speed, and then max HP, with any remaining EVs going into Defense and Special Defense, with most of the emphasis on Special Defense, as it is not only her greatest stat, but Ice Beam is her greatest fear, and you want to be able to survive it. Give her a Careful nature. That should just about do it for our little cotton soprano here.

Checks and Counters

Your best choices would be Hypno and Grumpig for the special attacker, albeit watch out for Toxics. Blastoise and Walrein pretty much stop Altaria all the time. If it's a Dragon Dancer, just send in your Solrock or Lunatone. Solid high HP Pokemon such as Kangaskhan and Granbull can easily take anything Altaria throws at them, too.