<p>The combination of Shaymin's bulk and Synthesis allows it to Swords Dance multiple times, which makes up for its low EV investment in Attack. Seed Bomb and Return provide decent coverage, only resisted by Drifblim, Wormadam-S, Registeel, Magneton and Mawile. Zen Headbutt is an option over Return, granting greater coverage on Pokemon such as Blaziken, Crobat, Roserade, and Venusaur.</p>
<p>In dealing with the Calm Minders of UU, Shaymin is somewhat overshadowed by Chansey, who has a much higher HP stat. However, Chansey is unable to beat Mismagius, by virtue of its Ghost-typing and Substitute, Clefable, thanks to Magic Guard, and Pokemon with Rest, such as Spiritomb. Shaymin can handily manage all three.</p>
<p>To demonstrate Shaymin's bulk, +1 Timid Espeon cannot 2HKO Shaymin without Stealth Rock support. If Stealth Rock is down, then the situation is still salvageable for the Shaymin user. If Shaymin switches in on a Calm Mind, Espeon has the ability to 2HKO Shaymin. However, if Shaymin uses Synthesis, once or twice depending on the damage roll, to recover back to full health, it can Swords Dance [removed comma] and KO Espeon with Seed Bomb without suffering a KO itself. If, however, Espeon Calm Minds during Synthesis, Shaymin will be unable to KO it before dying itself.</p>
<p>The utility of recovery and Shaymin's sturdiness are displayed even better when setting up on non-boosting attackers. Shaymin can beat most Venusaur, Uxie, Torterra, Rotom, and Encore-less Clefable one-on-one. It can even beat opposing (non-Specs) Shaymin, as long as they don't flinch you [space] too many times with Air Slash.</p>
<p>The 96 Attack EVs guarantees a KO on 108 HP Mismagius with Seed Bomb after a Swords Dance. If this doesn't concern you, only 36 Attack EVs are needed to guarantee a KO on Espeon, and the rest can be invested in HP. 96 Speed EVs bring Shaymin up to 260 Speed, allowing it to outspeed neutral-natured, max-speed base 80s, including Blaziken, Gardevoir, and Altaria. The rest of the EVs are poured into Special Defense and HP to enable to Shaymin to take special hits as well as possible.</p>
<p>Fire-types, such as Arcanine, Moltres, Charizard, and Typhlosion, are problematic for Shaymin. As such, using Stealth Rock is imperative. Regirock is a decent choice for allowing Shaymin to set up, especially one with Rest to rid itself of the Toxic that Arcanine and Moltres commonly carry. Bulky Water-types such as Slowbro and Milotic deal with these Fire-types as well as Steelix, who can Roar Shaymin out at full health. Physically defensive Poison-types, such as Weezing and Crobat, will also hinder Shaymin's sweep. Bulky special attackers such as Mespirit, Uxie, and Rotom can hit both of them with STAB Psychics and Thunderbolts, respectively. Registeel is undoubtedly the best counter to this Shaymin, sporting a resistance to both of its attacking moves. However, many Pokemon can capitalize on a Registeel switch-in; Blaziken, Nidoking, and Torterra pose numerous threats with their various STAB attacks and take little damage from Iron Head. Nidoking and Torterra also sport immunities to Thunder Wave. If you're looking for a Pokemon that takes the most advantage of all of Shaymin's common switch-ins, Omastar is one of the best options. It can switch into most of the common sets of these Pokemon and can take advantage of a free turn to set up Spikes, Toxic Spikes, or Stealth Rock.</p>