[OVERVIEW]
<p>Vaporeon is among the few who can claim to be a  true bulky  Water-type Pokemon of DPP OU. In a metagame rife with  residual damage  from sandstorm, entry hazards, and more, having a bulky  Water-type  Pokemon with the ability to pass Wish is invaluable to the  success of a  team. Within a tier of heavyweights, Vaporeon shines as  one of the few bulky Water-types that take minuscule damage from  Grass Knot, making it a  terrific Infernape counter. Vaporeon is also  the best Water-type to  switch into other Water-type Pokemon due to its  immunity to Water-type  attacks Water Absorb.</p>
<p>Despite its unique attributes as a Water-type, Vaporeon has   serious issues with specific and common moves and threats. Vaporeon is   deathly afraid of Toxic, as unlike Suicune, it will typically be unable   to Rest away the status. Additionally, Vaporeon has issues with its   inability to instantly heal itself like Milotic, which can be exploited   by opponents. Given Vaporeon's essential support role on teams that use   it, Vaporeon is often the primary target to KO immediately; teams tend   to collapse after Vaporeon has been felled. If you choose Vaporeon for   your team, it's important to do so with its specialties in mind, but   either way it will perform the chosen job admirably.</p>
[SET]
name: Wish Passer
move 1: Wish
move 2: Protect
move 3: Surf
move 4: Hidden Power Electric / Ice Beam / Toxic
item: Leftovers
Nature: Bold
EVs: 188 HP / 252 Def / 68 SpD
[SET COMMENTS]
<p>With a great base 130 HP stat, decent defenses, and access to a   useful move in Wish, Vaporeon becomes an incredible support member in   the OU metagame. Vaporeon can heal those who lack a self-recovery move   and generally keeps the team at a good level of health. Pokemon like   Dragonite and Gyarados, who are constant victims of Stealth Rock,  appreciate Wish in any case.</p>
<p>Protect is the second most important move of the set, because   without it, Vaporeon wouldn't be able to reliably heal itself and  keep  passing Wishes it allows Vaporeon to reliably heal itself and keep passing Wishes. Also, Protect is a handy move for scouting purposes,  and  restores HP thanks to Leftovers. Surf is the obligatory STAB move  to  use, and keeps Gliscor, physically defensive Skarmory, Infernape,  and  Heatran at bay. The last moveslot has several notable options. With   Hidden Power Electric, Vaporeon becomes one of the best counters to   Gyarados, even those who carry Taunt, and helps it deal with opposing   Water-types. On the other hand, Ice Beam keeps Dragonite, and Grass-type   Pokemon in general, in check. One  can also use Toxic, which when coupled  with Wish and Protect makes  Vaporeon able to Toxic stall numerous  Pokemon that it can't harm  greatly, such as specially bulky Pokemon and  Pokemon resistant to  Surf.</p>
[ADDITIONAL COMMENTS]
<p>Vaporeon has two other great moves it can use to help aid its   team: Roar and Heal Bell. Vaporeon makes a great user of Roar, stopping   several Pokemon from setting up and sweeping. As for Heal Bell, it  makes  Vaporeon a very effective cleric, curing its team and itself of  status  effects.</p>
<p>The reason why the EV spread makes special emphasis on  Vaporeon's HP and Defense stats is to upgrade enhance  its overall bulk and turn  it into a more reliable Wish Passer. Making  the HP stat divisible by 16  will maximize Leftovers recovery, and the  188 EVs achieve this. The 252  Defense EVs and Bold nature are used in  order to improve Vaporeon's  physical defense and provide it with the  necesary bulk to take hits from  the likes of Gyarados and Infernape  better. It is worth mentioning that  even using 252 HP / 252 Def EVs  Vaporeon only has a 3% of chances of  not being 2HKOed by  physically-based Infernape's Close Combat,  factoring  in SR + Leftovers; therefore, investing the rest of EVs in  Special  Defense is the advisable thing to do as this will allow  Vaporeon to take  special attacks slightly better.</p>
<p>Since Vaporeon is an excellent Pokemon in terms of durability very durable,   it is a good idea to couple it with offensive Pokemon who appreciate   Wish, such as Dragonite and Gyarados. That way, both will have an easier   time switching in and more opportunities to set up Dragon Dances ??? Vaporeon doesn't DD. Confusing wording.  Others who concentrate their strength in their defensive capabilities on defense,   such as Celebi and Gliscor, are great partners for Vaporeon too,  because  they can cover each other's weaknesses very well.</p>
[SET]
name: Choice Specs
move 1: Surf
move 2: Ice Beam
move 3: Hidden Power Electric
move 4: Wish / Signal Beam 
item: Choice Specs
Nature: Modest
EVs: 208 Def / 252 SpA / 48 Spe
[SET COMMENTS]
<p>Vaporeon is usually seen as a bulky Wish passer, but many   people forget to consider its fantastic 110 base Special Attack. With   Choice Specs, Vaporeon becomes an admirable offensive Pokemon that fits   very well on offensive teams that could use Wish support.</p>
<p>Surf is Vaporeon's primary attack option, a reliable STAB move   that, when boosted by Choice Specs, becomes enormously powerful. Ice   Beam and Hidden Power Electric provide additional type coverage,   dispatching most Grass- and Water-types who resist Surf, such as Celebi   and Gyarados, respectively. Wish is probably the  most recommended option  for the last slot, giving as it gives  Vaporeon the opportunity to set up Wish  against a threatened opponent  who will switch out and heal one of its  teammates that better  handles the opponent's switch-in.  Wish can also be used to  heal Vaporeon's own health, though use it at  your own risk as Vaporeon  may be set up on by the opponent. Signal Beam  is also another move to  consider, mainly designed to annihilate  Celebi, although Ice Beam  already does a lot of damage to it.</p>
[ADDITIONAL COMMENTS]
<p>The EVs and nature are pretty straightforward. Maximizing   Vaporeon's Special Attack is the first detail to consider for the set,   so 252 Special Attack EVs and a Modest nature put this stat to the   highest possible level, reaching 525 Special Attack. The 48 Speed EVs   allow Vaporeon to outspeed minimum Speed Skarmory. The rest of the EVs   are placed into Vaporeon's Defense, thus making it able to retain some   bulk to take a few hits.</p>
<p>Most of the time, offensive teams appreciate Wish support, and   Choice Specs Vaporeon is a great candidate for these type of teams,   because it doesn't slow down any offensive momentum. Pokemon such as   Dragonite and Gliscor are great partners for Vaporeon, since they cover   each other's weaknesses very well while maintaining a strong line of   offensive power. Offensive partners who defeat Blissey are also good   Pokemon to couple Vaporeon with, since she walls Vaporeon with no   problems at all. Breloom and Machamp make two fine partners for   Vaporeon, since they can easily get rid of Blissey with their respective   STAB moves. Entry hazard support is also welcome, as it helps Vaporeon   to score more OHKOes as well as while  helping its whole team in general.  Skarmory and Forretress can both  set up Spikes and propitiate Vaporeon  an important resistance  against Grass-type moves cover Vaporeon's Grass weakness.Forretress  also has  access to Rapid Spin, which is useful as it prevents  Vaporeon, as well  as your team in general, from getting in contact with  entry hazards. On  top of this, Forretress has Explosion available to  it, allowing it to  potentially bring down a dangerous foe.</p>
[SET]
name: Baton Pass
move 1: Baton Pass
move 2: Substitute
move 3: Acid Armor / Wish / Aqua Ring
move 4: Surf / Roar
item: Leftovers
ability: Water Absorb
nature: Bold
evs: 252 HP / 128 Def / 128 Spe
[SET COMMENTS]
<p>Baton Pass Vaporeon is a staple of OU Baton Pass teams for its   defensive aptitude, 101+ HP Substitutes, and access to numerous support   options that Baton Pass teams crave. Vaporeon's capacity to heal its   teammates with either Wish or Aqua Ring is fundamental to the team's   ability to outlast your opponent's onslaught long enough to finish the   chain.</p>
<p>Baton Pass is necessary to pass on both what is sent to   Vaporeon and what it sets up. One of the biggest lures of Vaporeon on   Baton Pass chains is its base 130 HP stat, which enables the passing of   immensely bulky Substitutes. In the third slot, Vaporeon has many   options that it can run effectively. Acid Armor buffers your team's   Substitutes and your entire chain with added Defense, which will enable   Pokemon like Ninjask and Smeargle to accomplish their goals even  against  physically powerful Pokemon like Metagross and Scizor. Wish  provides immense healing the turn after use, which enables it to  be Baton Passed  to teammates that need the HP. Aqua Ring, unlike Wish,  provides a more  gradual healing effect that can be included in the  Baton Pass chain and  passed around to the rest of your team. For the  final move, it is  recommended that Vaporeon use Surf. Surf has  excellent neutral coverage  in one move and prevents Vaporeon from being  Taunt bait. Roar is usable  over Surf for the ability to phaze opposing  Skarmory and Vaporeon, who  typically carry phazing moves of their own, although at the cost of  being very vulnerable to Taunt.</p>
[ADDITIONAL COMMENTS]
<p>252 HP EVs are used to maximize Substitute HP while also   buffering both Vaporeon's physical and special bulkiness. 128 Defense   EVs bolster Vaporeon's relatively low Defense stat, especially after an   Acid Armor boost. Presumably, before Vaporeon makes a showing in the   battle, some Speed has been included in the chain. With Speed, you can   afford to set up a Substitute against Pokemon that can do nothing to   Vaporeon and either Acid Armor or Baton Pass before the opponent's   switch-in to Vaporeon can attack. This is why 128 Speed EVs are   important, as they allow Vaporeon to use Baton Pass before Timid Jolteon   can do it serious harm or break its Substitute with Thunderbolt at +2 Speed.  These  Speed EVs also help Vaporeon with Roar to phaze Skarmory and  opposing  Vaporeon before they can phaze you first, if you chose it over  Surf ensure Roar beats opposing Skarmory and Vaporeon Roars, if applicable. A  Bold nature increases Vaporeon's physical bulkiness, while Leftovers  adds to its durability over time.</p>
<p>Perhaps the best partner to this Vaporeon is Baton Pass Gliscor   for his ability to switch into Electric-type attacks with impunity and   continue the chain. Gliscor can not only set up the Speed and Attack   boosts that a chain needs, but has access to Taunt and will lure Pokemon   and attacks that Vaporeon can take with ease. Baton Pass Zapdos makes   an excellent partner for similar reasons with excellent impressive  bulk, Agility,  and a resistance to Grass-type attacks. Typical  recipients for  Vaporeon's Substitutes and Defense boosts are physically  frail Pokemon  that are critical to the success of a Baton Pass chain,  such as Smeargle  or Ninjask. Vaporeon despises the presence of Toxic  Spikes, as they  reduce its effectiveness tremendously. This can be most  easily  ameliorated by Baton Passing Vaporeon a Substitute from the  likes of  Zapdos or Ninjask, although other options include Rapid Spin  or using a  grounded Poison-type. Tragically, there are no effective  Rapid Spin  users or grounded Poison-type Pokemon that can keep a Baton  Pass chain  alive, so you would be making a sacrifice to remove Toxic  Spikes from  play entirely.</p>
[TEAM OPTIONS]
<p>Vaporeon is most commonly seen on stall and balance  teams in conjunction  with defensive Pokemon such as Gliscor and  Celebi. Both provide Vaporeon  with a very welcome resistance to  Electric- and Grass-type moves,  respectively. In addition to this,  Gliscor can set up Stealth Rock,  which Vaporeon greatly benefits from  due to its ability to utilize Roar  and function as an effective  phazer its ability to phaze effectively and rack up residual damage.  Celebi and Shaymin, on the other  hand, can deal with opposing bulky  Water-type Pokemon thanks to their  bulk and STAB Grass-type moves. They  can also check enemy Grass-type  Pokemon if they run Hidden Power Fire.  Vaporeon makes a great partner to  Heatran for absorbing the Water-type  attacks aimed at it, while Heatran  gladly intercepts any Grass-type  move intended for Vaporeon. In the  offensive department, Pokemon such  as Dragonite and Scizor benefit  greatly from Vaporeon's Wish and its  overall defensive prowess.  Dragonite can act as a potent wallbreaker  with Wish support, which  Vaporeon can easily pass thanks to the good  synergy that it maintains  with this Dragon-type Pokemon. Scizor's  typing pairs well with Vaporeon,  as it can switch in on Grass-type  moves coming from the likes of  Shaymin, Celebi, or Roserade, and  threaten them with STAB U-turns or  Bullet Punch, while Vaporeon sponges Fire attacks.</p>
<p>Entry hazard support isn't necessary, but it is very useful   since Vaporeon can force many switches with Roar and its defensive   presence. With Protect, Vaporeon also stalls well, so Toxic Spikes are   worth considering. Forretress and Roserade synergize well with Vaporeon   and have access to Toxic Spikes, which will help Vaporeon against   Grass-types, Water-types, and Blissey. Skarmory is another solid option   to consider, as it can switch in on Pokemon such as Celebi and Shaymin   that threaten Vaporeon and proceed to lay down Spikes.</p>
[OPTIONAL CHANGES]
<p>Vaporeon has some interesting options that it can use in its   sets, but generally what you see is what you get in the above sets.   Muddy Water can be used over Surf just about anywhere for its secondary   effect, but the reduced accuracy is an enormous turnoff. Haze can be   useful as a means of removing stat boosts from last-Pokemon Suicune, but   generally Roar is the better choice for racking up entry hazard damage   in the earlier game. Heal Bell is cute usable  for supporting the team and  keeping Vaporeon safe from status, Toxic  in particular, but most sets  simply do not have room for it and other  Pokemon function better as  dedicated clerics. Fake Tears can be useful  for forcing additional  switches, but Vaporeon almost always has more  useful things to be doing  with its moveslots. A set based around Curse  could work in some  instances, but Umbreon does it better, and that says  something because  Umbreon barely does it well at all in the first  place.</p>
[COUNTERS]
<p>Various Pokemon can be a menace to Vaporeon. Grass-types, such  as Shaymin, Celebi, Breloom,  and Roserade, who can switch in with very  little care if  Vaporeon lacks Ice Beam. Similarly, Electric-types like  Rotom-A,  Jolteon, and Zapdos can get in on neutral Surf with their  respectable  bulk and use their STAB moves to hit Vaporeon for super  effective  damage, and in some cases, score the OHKO. Opposing Vaporeon  make great  switch-ins, since Vaporeon lacks ways to significantly damage  itself  without the help of Toxic. Without Hidden Power Electric, Taunt   Gyarados has free reign to set up Dragon Dances, and the likes of   Empoleon and Tentacruel will have no problems switching in and setting   up as well. Roar helps a lot against Kingdra, who can otherwise use   Dragon Dance on Roar without  anything to worry about; Roar is also  a good option to deal with bulky  Water-types such as Calm Mind Suicune  and the aforementioned Empoleon.  Blissey, of course, is a nightmare for  Vaporeon since she can sponge  all of its attacks thanks to her massive  HP and Special Defense stats;  however, Toxic can seriously threaten  Blissey and eventually force her  to switch out.</p>