[Pros]
<ul>
<li>It has a great defensive typing.</li>
<li>It has decent defensive stats and reliable recovery, which makes it a great spinblocker.</li>
<li>It has a respectable Attack stat.</li>
<li>It has access to Will-O-Wisp.</li>
<li>It has two great abilities, Natural Cure and Harvest.</li>
</ul>
[Cons]
<ul>
<li>It is slow.</li>
<li>Its bulk is lacking for a defensive Pokemon, which when coupled with its plethora of weaknesses makes it easy to take down.</li>
<li>It is Pursuit weak.</li>
</ul>
[Set Recommendations]
<p>name: Physically Defensive<br />
move 1: Horn Leech / Wood Hammer<br />
move 2: Rock Slide / Earthquake<br />
move 3: Will-O-Wisp<br />
move 4: Rest<br />
ability: Natural Cure / Harvest<br />
item: Leftovers / Lum Berry<br />
evs: 252 HP / 180 Def / 76 Spe<br />
nature: Impish</p>
<p>This set makes a great switch-in to Water-types such as Rotom-W, Gyarados, and Tentacruel, Ground-types such as Excadrill, Hippowdon, and Diggersby, and the omni-present Mega Kangaskhan. Thanks to its ability to heal off status and its Ghost typing, it doesn't mind status moves from the aforementioned Pokemon and spinblocks Excadrill. Horn Leech is the preferred STAB move because of its healing ability, but Wood Hammer has some nice perks, such as 2HKOing a burned Hippowdon, dealing 66.29 - 78.45% to 252 HP Mega Blastoise, and 2HKOing 252 HP Florges. 2HKOing Florges and burned Hippowdon is useful because otherwise they could switch into Trevenant relatively easy and provide support for their team (sandstorm, Wish, or Aromatherapy), and dealing as much damage as possible to Mega Blastoise is useful to hopefully prevent it from spinning if it gets past Trevenant. Rock Slide OHKOes standard Talonflame 37.5% of the time, Charizard and Mega Charizard Y 81.25% of the time, and always OHKOes offensive Volcarona, while Earthquake 2HKOes Mega Charizard X 90.63% of the time and always 2HKOes Mega Gengar, all Pokemon which could otherwise switch easily into Trevenant. Will-O-Wisp patches up Trevenant's weak physical side and neuters physical attackers that Trevenant checks, such as Excadrill and Breloom.</p>
<p>The combination of Lum Berry and Harvest allows Trevenant to heal and cure status without the need to switch out, but Natural Cure is more reliable as it always works when you want it to and the extra recovery from Leftovers is huge for a defensive Pokemon. The EV spread makes Trevenant fast enough to outspeed Choice Band Scizor and specially defensive Tyranitar and burn them before they can hurt Trevenant with Pursuit, Crunch, or U-turn. The rest of the EVs are thrown into HP and Defense to tank hits from Excadrill better. Specially defensive Tyranitar and Rotom-W are good teammates as they can take care of most Fire-types that Trevenant struggles with. Tyranitar also provides Stealth Rock which Trevenant can help keep on the field. Spikes or Toxic Spikes users are appreciated as well, due to Trevenant's ability to force a lot of switches and act as a good spinblocker. Tentacruel and Greninja have good defensive synergy with Trevenant and provide Toxic Spikes and Spikes.</p>
<p>name: SubSeed<br />
move 1: Will-O-Wisp<br />
move 2: Leech Seed<br />
move 3: Substitute<br />
move 4: Phantom Force<br />
ability: Harvest<br />
item: Sitrus Berry<br />
evs: 252 HP / 180 Def / 76 Spe<br />
nature: Impish</p>
<p>With the combination of Will-O-Wisp, Leech Seed, and Substitute, Trevenant can slowly KO any Pokemon that can't deal 75% damage or more to it, provided it gets a free turn to set up a Substitute. If the opponent brings in a physical attacker, use Will-O-Wisp; otherwise Leech Seed is the way to go. From there, Trevenant can start spamming Substitute while staying healthy thanks to Sitrus Berry and Leech Seed. If a Sitrus Berry is not created by Harvest at the end of the turn, use Phantom Force the next turn, to stall for two extra turns, giving you a 75% chance of getting at least one Sitrus Berry back.</p>
<p>The EV spread uses enough Speed investment to outspeed uninvested Scizor and Tyranitar in order to burn them before they can attack Trevenant. The rest of the EVs are thrown into HP and Defense to tank hits from Excadrill better. Toxic Spikes support is very beneficial to speed up the process of stalling out special attackers and also allows Trevenant to stall to death grounded Fire-types. Greninja and Tentacruel are good partners for this job and have good defensive synergy with Trevenant. Lastly, Tyranitar and Rotom-W can help Trevenant by dealing with the Fire-types it fears.</p>
[Checks and Counters]
<p>Fire-types are the best way to deal with Trevenant. Volcarona, Talonflame, and Charizard have little to fear other than Rock Slide and can OHKO Trevenant in return. Strong special attackers that can OHKO Trevenant or deal 75% or more damage to it and don't care about Grass-type attacks are also good checks. Such Pokemon are Gengar, Hydreigon, Togekiss, Goodra, and Aegislash. Fast Pursuit users such as Absol and Choice Scarf Tyranitar can put Trevenant into a 50-50 situation, OHKOing it if they predict correctly. Furthermore, Mega Absol switches into Trevenant relatively easy if it has already Mega Evolved, bouncing back Leech Seed and Will-O-Wisp, and checkmates Trevenant with Pursuit while Mega Absol is only 2HKOed by Trevenant's attacks. Finally, while Skarmory detests burns in general, it walls Trevenant and can avoid getting stalled to death thanks to Roost, while setting up Spikes and phazing Trevenant when it's finished.</p>
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