Blissey's job gets harder and harder with each new generation. ADV forced Blissey to deal with Substitute + Calm Mind users, while DPP introduced overall stronger opposing Pokemon as well as Nasty Plot, Life Orb, and Choice Specs to boost special moves. BW is Blissey's toughest challenge yet: with the introduction of Psyshock, special attackers can hit Blissey's Defense instead of her Special Defense. Additionally, the stronger Fighting-type Pokemon introduced in this generation force Blissey out much more often. However, Blissey managed to gain one massive boost. With the new Wish mechanics, Wish now heals 50% of the user's HP, meaning that Blissey will be able to heal most injured Pokemon back to full health. Furthermore, she still has the Special Defense to tank many attacks despite competition from her younger sibling Chansey. With the proper teammates, Blissey can still wall the majority of special attackers and be a general nuisance to the opposing team.
Thanks to her enormous base 255 HP and 135 Special Defense stats, Blissey is one of the best special walls in the game, facing competition only from Eviolite Chansey. However, Blissey boasts Leftovers recovery that negates sandstorm and other residual damage. Additionally, if Blissey loses her Leftovers, she is only slightly harmed, whereas Chansey loses much of her effectiveness in taking attacks if she loses her Eviolite. Furthermore, Blissey has usable Special Attack (unlike Chansey, who is forced to use Seismic Toss).
This set concentrates on general support for the team. It can be used to either remove crippling status conditions from the team with Aromatherapy or set up Stealth Rock. A stall team is often maimed by opposing Toxic Spikes if its Rapid Spin user cannot remove the entry hazards fast enough. With Aromatherapy, your team isn't required to have a dedicated status absorber, as Blissey can just heal them later. It will also remove difficult status conditions, such as poison on Hippowdon or a burn on Ferrothorn. Meanwhile, having Stealth Rock on Blissey means your previous Stealth Rock user can utilize another support or attacking move.
Softboiled provides Blissey with instant recovery in order to ensure that she can continue utilizing her cleric abilities. The choice of Seismic Toss or Flamethrower presents itself once again. Seismic Toss provides consistency, while Flamethrower enables Blissey to hit some targets, such as Ferrothorn and Scizor, for more damage. Toxic, like in the previous set, prevents sweepers from setting up in front of Blissey for free.Team Options & Additional Comments >>>
Wish, with its new mechanics, can fully heal many Pokemon regardless of whether they invest in HP themselves thanks to Blissey's titanic HP stat. Protect is the main option to be paired up with Wish, as it enables Blissey to get off a guaranteed Wish for herself and scout out the opposing Pokemon's move. It also makes it easier for Blissey to stall the opposing Pokemon with Toxic. However, Softboiled can be used if you want Wish's PP to be concentrated on your team instead of Blissey. Moreover, it doesn't force Blissey to stay in and use Protect in order to be healed; instead, it allows for instant recovery in desperate times.
Seismic Toss is chosen for consistency because it inflicts constant damage on everything except Ghost-types. Alternatively, Flamethrower can be used in order to further emphasize what Blissey has over Chansey. With Flamethrower, Scizor and Ferrothorn are both hit harder than with Seismic Toss. Toxic fits into the last moveslot in order to cripple opposing Pokemon by steadily removing their HP.Team Options & Additional Comments >>>
Although Calm with maximum investment in Special Defense EVs are optimal for Blissey's primary role of absorbing powerful special hits, a Bold nature can be utilized to augment Blissey's physical bulk. Maximum EV investment in HP and Defense with a Bold nature transforms Blissey into a better mixed wall, but her special defense does take a notable dip.
Thunderbolt can be used as the attacking move, but many of the Pokemon that are hit by Thunderbolt, such as Tornadus, are also crippled by Toxic or Thunder Wave anyway. A set with two attacks can be used to improve coverage, with Softboiled and a status move rounding out Blissey's moveset. However, this set is less effective in terms of team support, lacking both Wish and Aromatherapy.
Counter can work as a surprise move but is hard to use because of the increase in power of physical attacks, increasing the likelihood of Blissey being crippled. Charm can weaken physical blows and cause the opposing Pokemon to switch out, racking up more entry hazard damage; however, it is incompatible with Seismic Toss. Calm Mind may be used in order to give Blissey some offensive prowess, but new Fighting-type Pokemon and the advent of Psyshock make it difficult for Blissey to set up effectively.
Checks and Counters
Fighting-types such as Terrakion, Lucario, and Breloom can come in on Blissey and scare her away with powerful STAB moves. Lucario is also immune to Toxic, which enables it to switch in more easily. Conkeldurr can freely switch in on any of Blissey's moves without fearing any form of status due to its ability, Guts. It can also heal off any damage taken with Drain Punch. Gliscor with Poison Heal can come in on any status move and use Taunt or Toxic to shut Blissey down. Alternatively, it can just directly attack with STAB Earthquake.
Although Machamp fears status moves, it can come in and launch a DynamicPunch at Blissey. Scrafty has Drain Punch to heal off any damage taken and can use Rest or Shed Skin to heal itself of status ailments. Furthermore, it can use Bulk Up to power up his moves even more. Toxicroak isn't afraid of Toxic and is often paired up with Drizzle in order to heal away any Seismic Toss damage. It can then utilize a Bulk Up and Drain Punch combination like Scrafty or pose a more immediate threat with Swords Dance. Ferrothorn can come in, set up free layers of Spikes or Stealth Rock, and use Leech Seed to slowly drain away Blissey's HP. Both Skarmory and Forretress can also accumulate many layers of entry hazards against Blissey (provided Blissey lacks Flamethrower).
Espeon can come in freely and Calm Mind in front of Blissey, not fearing Toxic or Thunder Wave due to Magic Bounce. Jirachi can utilize Substitute and Wish to make setting up Calm Mind easy, while Reuniclus has Magic Guard and Recover to ignore Toxic and heal off Seismic Toss damage. All three of them can also fire off a boosted Psyshock against Blissey. Taunt users such as Gliscor and Sableye can prevent Blissey from inflicting status or healing off any damage. Pokemon that carry Trick, such as Latios, can also Trick Blissey a Choice item and cripple her defensive capabilities.