Gen 9 National Dex Unexpected Scarfer
Tapu Koko @ Choice Scarf
Ability: Electric Surge
Tera Type: Electric
EVs: 44 HP / 252 SpA / 212 Spe
Modest Nature
- Thunderbolt
- U-turn
- Dazzling Gleam
- Hidden Power [Ice]
I've seen this pop up on ladder a few times, and I think it's a good fit for teams that struggle to deal with opposing Scarfers or faster Pokemon. 212 Speed EVs outspeeds most viable scarfers / speed boosting mon, including Urshifu-Rapid, Iron Treads, Volcarona, and ScarfTana. Additionally, this Koko also threatens Mega Lopunny, a traditionally fast threat that can be an issue to many teams. The moveset is standard; U-Turn over Volt Switch is for more reliable pivoting, and HP Ice allows Koko to actually make use of outspeeding Treads by hitting it for decent damage.
This Koko fits on teams that do not have a designated speed control mon; for example, teams with Valiant, Boulder, or Scarf Meowscarada do not have much use for Scarf Koko. Instead, it should be used alongside strong wallbreakers and sweepers that struggle to set up against common speed-boosting Pokemon. For example, Mega Medicham, one of Koko's best wallbreaking partners, struggles against ScarfShifu and ScarfTana due to their enhanced speed and ability to threaten a KO, especially with Tera active. ScarfKoko can find an opportunity to switch in and remove them, especially since they would not expect Koko to be scarfed.
The given EV spread outspeeds ScarfTana; however, if you want to outspeed specific Pokmon, here are some alternative EV spreads (in ascending speed order):
ScarfLele: EVs: 168 HP / 252 SpA / 88 Spe
+2 Swampert-Mega (Adamant): EVs: 160 HP / 252 SpA / 96 Spe
ScarfShifu: EVs: 148 HP / 252 SpA / 108 Spe
+1 Crown: EVs: 140 HP / 252 SpA / 116 Spe
+1 Volcarona: EVs: 124 HP / 252 SpA / 132 Spe
+1 Treads: EVs: 68 HP / 252 SpA / 188 Spe
+2 Swampert-Mega (Jolly): EVs: 40 HP / 252 SpA / 216 Spe
The following EV spreads use a Timid nature instead of Modest and are generally not recommended as there are better ways to deal with these Pokemon:
ScarfMeowscarada: EVs: 56 HP / 252 SpA / 200 Spe
+1 Boulder: EVs: 48 HP / 252 SpA / 208 Spe