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Overview
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Rotom-W is a great glue Pokemon in the metagame. Its outstanding defensive typing and with Levitate leaves it with just a single weakness and several resistances to common attacking types. This allows Rotom-W to be a fantastic check to top-tier threats such as Heatran, Talonflame, and Landorus-T. Will-O-Wisp and Thunder Wave are great assets, as both can cripple giant portions of the metagame. Unfortunately for Rotom-W, its HP and Speed stats are rather lackluster, and faster wallbreakers such as Mega Kangaskhan and Latios can easily break through it. Its offensive coverage is also walled by most Grass- and Dragon-types, which is annoying.
Special Tank
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name: Special Tank
move 1: Hydro Pump
move 2: Thunderbolt
move 3: Will-O-Wisp / Thunder Wave
move 4: Protect
item: Sitrus Berry
evs: 252 HP / 136 SpA / 120 SpD
nature: Calm
Moves
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This is by far Rotom-W's most consistent set, doing an amazing job at checking or countering various Fire-, Flying-, and Water-types. Hydro Pump is a solid STAB move that allows it Rotom-W to score OHKOs on Landorus-T, Volcarona, and offensive variants of Heatran. Thunderbolt is there for dual STAB coverage, mostly used to hit Water-types that resist Hydro Pump, its more powerful STAB attack as well as threats such as Mega Charizard Y. It Thunderbolt is also more consistent than Hydro Pump due to its better accuracy. In the third slot, Will-O-Wisp is a great way to deal with most physical attackers in doubles, and Thunder Wave offers excellent speed control. Protect keeps Rotom-W alive, protects it from attacks, stalls field conditions, and scouts for attacks.
Set Details
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There is are a variety of different spreads Rotom-W can run, usually mixing different HP, Special Defense, and Special Attack investments. The given spread allows it to survive a Modest Solar Beam from Modest Mega Charizard Y, while retaining maximum HP and as much Special Attack as possible. Sitrus Berry is by far the most consistent item option for Rotom-W, but if you have nothing better for the fourth moveslot, ChestoRest is another different option for healing.
Usage Tips
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Rotom-W should be played as a bulky offensive glue Pokemon. This means that it should be switching into opposing threats, (parentheses to commas) usually Water-, Flying-, or Ground-types, and either dealing spreading damage or spreading status. Thanks to its amazing typing, it does this fairly consistently. It Rotom-W also does a great job of tanking SlideQuake, which is a very popular coverage combination for on Ground-types. The only Pokemon you Rotom-W should really fear with Rotom-W out are Grass- and Dragon-types, especially specially offensive ones if they primarily use special attacks. Threats with Lum Berry, such as Ferrothorn and Garchomp, like to lure it Rotom-W and hit really hard, so watch out for that. Make sure Rotom-W stays alive if the opponent is holding back Talonflame or Heatran, because they can be really threatening late-game lategame if Rotom-W is taken out.
Team Options
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Fire-types such as Heatran, Talonflame, and Charizard are arguably the best partners to Rotom-W, as they benefit well from having a partner that can sponge threatening Ground- and Rock-type attacks, and they can take out the Grass-types that threaten Rotom-W. Steel-types such as Mega Scizor, Mega Lucario, Heatran, and Aegislash complement Rotom-W well defensively, as they resist Dragon- and Grass-type attacks, and Rotom-W resists Fire-type attacks; good examples include Mega Scizor, Mega Lucario, Heatran, and Aegislash. Ground-types appreciate Rotom-W as a partner, as they can freely use Earthquake beside it; Mamoswine is especially relevant here, as it can snipe down Dragon- and Grass-types with ease.
Other Options
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Rotom-W can run Electroweb alongside Will-O-Wisp to offer both speed control and burn support, and with 56 Speed EVs, it can outspeed -1 Mega Kangaskhan and Mega Charizard Y, but outside of other than that, Thunder Wave is the more consistent option. Light Screen is an option if its Rotom-W's team is weaker on the specially defensive side. Assault Vest could work with Electroweb or Volt Switch, but Rotom-W will miss Sitrus Berry's recovery and the utility of its status attacks and Sitrus Berry's recovery. Choice Specs Rotom-W can deal surprising damage to some switch-ins. (period), and using A Choice Scarf allows it to outrun threats that would stay in against it, such as Mega Charizard Y, Mega Kangaskhan, and Mega Gyarados, (comma) as well as standard Choice Scarf Landorus-T, (remove comma) if it Rotom-W runs a Timid nature. With Choice sets, Rotom-W can also use Trick, which is an outstanding countermeasure against Trick Room teams.
Checks & Counters
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**Offensive Typing Advantage**: Lum Berry Ferrothorn is a fantastic answer to Rotom-W as it shrugs off every attack Rotom-W offers. Amoonguss is also a major pain because it redirects and tanks everything Rotom-W uses. Other Grass-types, (comma) such as Venusaur and Shaymin-S, (comma) can outspeed Rotom-W and threaten it with their STAB moves, but they must avoid switching in on Thunder Wave. Dragon-types such as Latios, Kyurem-B, and Hydreigon also beat Rotom-W, but they must be wary of Thunder Wave. Excadrill and Mega Gyarados deserve special mentions, (remove comma) because they can bypass Levitate with Mold Breaker and strike Rotom-W with super effective Earthquakes.
**Strong Attackers**: Several Pokemon can strike through Rotom-W's average defenses and deal huge damage with their STAB attacks. Mega Kangaskhan, Deoxys-A, Terrakion, and Mega Heracross can KO it with their STAB attacks with after only a little prior damage, but they must find a way to switch in safely. Guts Conkeldurr benefits from status conditions, can tank Rotom-W's attacks, an threatens it with Drain Punch.
**Utility Moves**: Taunt users such as Thundurus and Sableye can stop Rotom-W from supporting its team. Substitute users such as Kyurem-B with decent bulk or resistances to its Rotom-W's attacks, such as Kyurem-B, make excellent counters as well.