>>21474678>Swampert trucks it and doesnt need rain to outspeed though I dont know how well it shrugs off Shadow Balls.Relevant calcs against Aegislash-720 (aka Shield and blade simultaneously)
252+ SpA Aegislash-Blade Shadow Ball vs. 0 HP / 0 SpD Swampert: 147-174 (43.1 - 51%) -- 3.1% chance to 2HKO
>252+ Atk Swampert Earthquake vs. 252 HP / 0 Def Aegislash-Shield: 282-332 (87 - 102.4%) -- 18.8% chance to OHKOWeakness Policy Aegislash can gamble on the 4/5 chance to take the EQ, and then gamble its own 1/8 chance to OHKO
+2 252+ SpA Aegislash-Blade Shadow Ball vs. 0 HP / 0 SpD Swampert: 294-346 (86.2 - 101.4%) -- 12.5% chance to OHKO
But, statistically speaking, Aegislash loses, and Swampert might be able to KO or guaranteed after some prior damage