If you don't want to be like pretty much every team that lacks a Kommo-o or Blissey / Chansey, you need an Ash-Greninja check or it will run you over. Blissey and Chansey can't switch into Knock Off and can't switch into Greninja with Spikes / Stealth Rock up repeatedly, Kommo-o has a very unfavorable matchup against Clefable... Urshifu-R still is weak to Moonblast, but its lack of a 4x weakness helps there. Yep, here's a defensive Urshifu-R. Very anti-meta but who cares!
Urshifu-Rapid Strike @ Assault Vest / Heavy-Duty Boots / Leftovers
Ability: Unseen Fist
EVs: 252 HP / 156 SpD / 100 Spe or 252 HP / 248 SpD / 8 Spe
Careful / Jolly Nature (depending on the EV spread)
- Drain Punch
- U-turn
- Poison Jab / Scald
- Surging Strikes
Drain Punch is STAB and recovery. U-turn allows Urshifu-R to pivot out of unfavorable matchups, and scouts the enemy's switch. If Urshifu is holding Heavy-Duty Boots, it can ignore Greninja and Ferrothorn's Spikes. Poison Jab hits Clefable and Tapu Fini and can poison, Scald is weak but it can burn. Surging Strikes is Urshifu-R's strongest move and allows it to break Substitutes.
100 Speed EVs and a Careful nature or 8 Speed EVs and a Jolly Nature allow Urshifu-R to hit 255 Speed, which lets it outspeed Modest Heatran, 112 Speed Landorus-Therian, Timid Magearna, and 20 Speed Jolly Gliscor.
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 252 HP / 248 SpD Assault Vest Urshifu-Rapid-Strike: 110-129 (27.2 - 31.9%) -- guaranteed 4HKO
252 SpA Choice Specs Greninja-Ash Dark Pulse vs. 252 HP / 248 SpD Assault Vest Urshifu-Rapid-Strike: 80-94 (19.8 - 23.2%) -- possible 5HKO
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 252 HP / 248 SpD Assault Vest Urshifu-Rapid-Strike: 110-129 (27.2 - 31.9%) -- guaranteed 3HKO after 3 layers of Spikes
252 SpA Choice Specs Greninja-Ash Dark Pulse vs. 252 HP / 248 SpD Assault Vest Urshifu-Rapid-Strike: 80-94 (19.8 - 23.2%) -- guaranteed 4HKO after 3 layers of Spikes
0 Atk Urshifu-Rapid-Strike Drain Punch vs. 0 HP / 4 Def Greninja-Ash: 282-332 (98.9 - 116.4%) -- 87.5% chance to OHKO
0 SpA Clefable Moonblast vs. 252 HP / 248 SpD Assault Vest Urshifu-Rapid-Strike: 144-170 (35.6 - 42%) -- guaranteed 3HKO after Stealth Rock
0 Atk Urshifu-Rapid-Strike Surging Strikes (3 hits) vs. 0 HP / 0 Def Heatran on a critical hit: 306-360 (94.7 - 111.4%) -- approx. 81.3% chance to OHKO
0 Atk Urshifu-Rapid-Strike Drain Punch vs. 252 HP / 252+ Def Blissey: 368-434 (51.5 - 60.7%) -- guaranteed 2HKO