Dragonite @ Leftovers
Ability: Inner Focus
Calm/Careful nature
248 HP, 216 SpD, 44 Spe
-Heal Bell/Light Screen
-Roost
-Thunder Wave/Toxic
-Dragon Claw/Flamethrower
Dragonite's humongous Attack stat often undermines its above average
Special Defense. Although Latias has a much higher Special Defense
stat, Dragonite has a slightly different typing, access to Heal Bell,
and possesses Inner Focus, making this set perfectly viable. Although
Inner Focus may seem like nothing special, it makes Dragonite one of
the best counters to Togekiss.
Heal Bell is the preferred option over Light Screen simply because
Latias lacks the move. Dragonite is also one of the few viable clerics
on OU, but Light Screen is always helpful when trying to set up a sweep
or Toxic stalling. Roar is also a possibility, but better left to
Latias who can effectively Roar away Calm Minders such as Jirachi and
Suicune. Roost is necessary to keep Dragonite healthy and continue his
job. Thunder Wave is always a useful status move, slowing down many
Pokémon. Toxic however, when used in conjunction with Light Screen and
Roost, can stall out walls which use Special Attacks, such as Vaporeon
and Blissey. Dragon Claw is your generic STAB move which works well off
of your high 134 base Attack. If you are using Toxic, you are better
off with Flamethrower which hits the Steel-types immune to Toxic.
Flamethrower can also catch Skarmory, Scizor, or Forretress off guard,
expecting to wall a physical attacker. Use a Careful nature with Dragon
Claw, and a Calm nature with Flamethrower.
The 44 Speed EVs are important on this set as they put Dragonite's
speed at 207. This is usually enough to out speed Magnezone and will
get the jump on Bold Suicune, Cresselia, and Milotic. This speed is
vital because all four of these Pokémon commonly carry an Ice move to
dispose of Dragons. With the additional speed, you can set up a Light
Screen in front of them and proceed to Toxic stall or scout for a full
paralysis before switching out. The rest of the EVs give Dragonite 385
HP, which allows Stealth Rock damage to round down while giving a
favorable Leftovers threshold, and 319 Special Defense, which is the
highest possible bonus point for the remaining EVs.