Gen 9 National Dex Monotype Swords Dance + Z Move (Ice)

Weavile @ Darkinium Z
Ability: Pressure
Tera Type: Dark
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Foul Play
- Knock Off
- Ice Shard / Icicle Crash / Triple Axel
An interesting take on Swords Dance Weavile for Ice teams in Gen 9 National Dex Monotype. With Swords Dance, Weavile can turn into a potent cleaner / breaker. And now to address the elephant in room, which is Foul Play on a Swords Dance set. Normally, Foul Play isn't good with Swords Dance since it deals more damage when the opponent's attack stat is higher than your own. However, the reason Foul Play is here for the base move you use for Blackhole Eclispe. With Foul Play, you get a one-time nuke that has 175 BP, which is notably stronger than Knock Off's Z power of 120 when you use it for a Z move. Foul Play's base power for Z moves power allows Weavile to be able to break past bulky walls more easily than Z-Knock Off would. Here are calcs for comparison:
Z-Foul Play
+2 252 Atk Weavile Black Hole Eclipse (175 BP) vs. 252 HP / 252+ Def Toxapex: 288-339 (94.7 - 111.5%) -- 68.8% chance to OHKO
+2 252 Atk Weavile Black Hole Eclipse (175 BP) vs. 248 HP / 232+ Def Archaludon: 328-387 (85.6 - 101%) -- 6.3% chance to OHKO
+2 252 Atk Weavile Black Hole Eclipse (175 BP) vs. 248 HP / 244+ Def Venusaur-Mega: 339-399 (93.3 - 109.9%) -- 62.5% chance to OHKO
+2 252 Atk Weavile Black Hole Eclipse (175 BP) vs. 248 HP / 212+ Def Celesteela: 393-463 (98.9 - 116.6%) -- 93.8% chance to OHKO
Z-Knock Off
+2 252 Atk Weavile Black Hole Eclipse (120 BP) vs. 252 HP / 252+ Def Toxapex: 198-234 (65.1 - 76.9%) -- guaranteed 2HKO after Black Sludge recovery
+2 252 Atk Weavile Black Hole Eclipse (120 BP) vs. 248 HP / 232+ Def Archaludon: 225-265 (58.7 - 69.1%) -- guaranteed 2HKO after Leftovers recovery
+2 252 Atk Weavile Black Hole Eclipse (120 BP) vs. 248 HP / 244+ Def Venusaur-Mega: 232-274 (63.9 - 75.4%) -- guaranteed 2HKO
+2 252 Atk Weavile Black Hole Eclipse (120 BP) vs. 248 HP / 212+ Def Celesteela: 270-318 (68 - 80.1%) -- guaranteed 2HKO after Leftovers recovery
With Stealth Rock up, you can guarantee OHKOs against Pokemon such as Toxapex and Mega Venusaur with Z-Foul Play. Knock Off is here to remove items and is your actual spammable Dark STAB on this set when you aren't using your Z-move. The last slot is up to preference. Ice Shard is usually used since it gives Weavile a priority move to use against faster Pokemon. Icicle Crash / Triple Axel can be used if you have Ice Shard on another teammate. Icicle Crash is used for a consistent Ice STAB that avoids things such as Rocky Helmet, Static, and Iron Barbs, while Triple Axel can be used for a more powerful Ice STAB. Darkinium is used over Icium Z since Weavile hits a lot more things neutrally with Dark STAB than Ice STAB, which is really valuable for Ice teams.
Foul Play is mainly here for the base move for Darkinium Z. Foul Play is NOT the spammable Dark STAB on this set. Knock Off is the spammable Dark STAB you use when you aren't using Darkinium Z.