Moves
Dhelmise is a reliable spinner thanks to its ability to beat common Stealth Rock setters either with its powerful moves or by trapping and stalling them out. Power Whip is Dhelmise's strongest STAB move and hits Stealth Rock setters like Rhyperior, Nidoqueen, and Palossand very hard. Thanks to Dhelmise's ability in Steelworker, Anchor Shot receives the same power boost as a STAB move, which allows Dhelmise to OHKO Diancie and hit Flying- and Grass-types like Noivern, Virizion, and Roserade for good damage. It also traps opposing Pokemon and gives Dhelmise the ability to prevent double switches as well as PP stall walls like Registeel and Bronzong with Rest. Rest is used over Synthesis because it gives Dhelmise a better matchup versus Bronzong and Registeel and allows it to act as a status absorber for the team. However, Synthesis can be used to better check threats like Virizion, Zygarde-10%, and Raikou. However, Synthesis has low PP, and without Rest, Dhelmise can't beat Registeel and Bronzong.
Set Details
The given Attack investment with an Adamant nature allows Dhelmise to OHKO Zygarde-10% with Power Whip and 2HKO Virizion with Anchor Shot. 84 Speed EVs enable Dhelmise to outspeed uninvested base 50 Speed Pokemon like Registeel, Donphan, and Diancie. The remaining EVs are placed in HP and Defense to check threats like Virizion, Zygarde-10%, and Raikou more effectively. Colbur Berry allows Dhelmise to take a Dark-type move such as Mega Blastoise's Dark Pulse better as well as weaken Knock Off or Pursuit from Pokemon like Donphan, Machamp, and Drapion. If running Steelium Z, Dhelmise can OHKO Virizion from full with Corkscrew Crash. Optionally, Dhelmise can use 100 Attack EVs to ensure that it OHKOes Noivern from full with Corkscrew Crash. However, without Colbur Berry, Dhelmise is more easily Pursuit trapped and KOed by strong Dark-type moves like Dark Pulse from Mega Blastoise and Pangoro.
Usage Tips
Dhelmise should be brought in on Stealth Rock setters and Pokemon that can't threaten it such as Rhyperior, Registeel, and Virizion. These are matchups where Dhelmise can easily use Rapid Spin to clear the field of entry hazards, if needed. Keep in mind that every Pokemon can be brought into Rapid Spin due to its lack of power. Thus, in some cases, it can be better to predict a switch with Power Whip or Anchor Shot. Anchor Shot is a good move in general because it can trap the opposing Pokemon and prevent a double switch. If the opponent has Bronzong, Registeel, or Forretress without Volt Switch as their Stealth Rock setter, try to trap it with Anchor Shot and stall its PP out. If using Rest, Dhelmise can be used as a status absorber for the team. However, keep in mind that Dhelmise will be forced to sleep for two turns, which allows various Pokemon to take advantage of it, especially setup sweepers like Barbaracle, Necrozma, and Toxicroak. If using Synthesis, Dhelmise can check physical threats like Virizion and Zygarde-10% more effectively as well as pivot into resisted or weak hits like Leaf Storm from Mega Sceptile and Roserade or Moonblast from Florges. However, without Rest, Dhelmise is unable to beat Registeel and Bronzong and can't be used as a status absorber for the team. Dhelmise should also avoid switching into a potential Scald from a Water-type like Slowbro or Milotic. Steelium Z allows Dhelmise to use Corkscrew Crash in order to KO Pokemon that can usually take a hit from it like Noivern and Bewear. In case of softer checks like Noivern, try to use the Z-Move on their switch to KO them. Bulky Pokemon like Bewear will need to be chipped before Dhelmise can KO them.
Team Options
Dhelmise fits best on balance and bulky offensive teams because it is able to compress the role of entry hazard control and act as a check to common threats like Virizion, Zygarde-10%, and Raikou, which is very valuable for these archetypes. Pokemon weak to Stealth Rock, such as Ninetales, Salazzle, and Noivern, appreciate Dhelmise's ability to act as a reliable spinner. They also take advantage of its ability to switch into strong attacks for them. Entry hazard setters like Golisopod and Dragalge or just Stealth Rock setters in general like Nidoqueen, Bronzong, and Diancie appreciate that Dhelmise can spinblock foes like Forretress, Tsareena, and Donphan. They also like that Dhelmise doesn't clear their own entry hazards away with Defog. Wish support from Pokemon like Florges and Vaporeon is very helpful so that Dhelmise is not always forced to recover up with Rest. Both of them can also support Dhelmise with Heal Bell. Water-types like Slowbro, Mantine, and Gastrodon are in general very good teammates because they can switch into Fire- and Ice-types moves. Dhelmise, in return, can switch into Grass- and Electric-types moves for them. Pokemon like Bewear, Florges, and Diancie are capable of checking Dark-types like Drapion and Mandibuzz and can switch into Knock Off from opposing Pokemon. Diancie can also switch into Flying-types like Noivern and supports Dhelmise with Heal Bell. Hariyama deserves a special mention, as it can check Dark-types while also providing a Fire- and Ice-type resistance with Thick Fat. Last but not least, since Dhelmise is not a check to Mega Blastoise, it's important to have a Pokemon that can switch into Mega Blastoise's attacks such as Florges, Gastrodon, and Hariyama.