I gotta say I've been having a lot of success on Hyper Offense using Miracle Seed Rillaboom
Rillaboom @ Miracle Seed
Ability: Grassy Surge
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Swords Dance
- Grassy Glide
- Wood Hammer
- Superpower
View attachment 380919
The Immediate burst in power allows it to deal massive amounts of damage to break opponents such as Unaware Clef, Toxapex, Tornadus, and enables it to deal a hefty chunk to Landorus trying to U-Turn on a predicted swords Dance, easily opening up dangerous team-mates when Landorus tries to U-Turn for momentum.
-1 252+ Atk Miracle Seed Rillaboom Wood Hammer vs. 252 HP / 4 Def Landorus-Therian in Grassy Terrain: 237-279 (62 - 73%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
-1 252+ Atk Miracle Seed Rillaboom Wood Hammer vs. 252 HP / 164+ Def Landorus-Therian in Grassy Terrain: 183-216 (47.9 - 56.5%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
+1 252+ Atk Miracle Seed Rillaboom Wood Hammer vs. 252 HP / 252+ Def Landorus-Therian in Grassy Terrain: 376-444 (98.4 - 116.2%) -- guaranteed OHKO after Stealth Rock
In comparision
+1 252+ Atk Miracle Seed Rillaboom Grassy Glide vs. 252 HP / 252+ Def Landorus-Therian in Grassy Terrain: 220-259 (57.5 - 67.8%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
This is all made possible by Wood Hammer reaching a staggering 187 base power in terrain with Miracle Seed, enabling it to be stronger than both Double Iron Bash and Victini's V-Create without Life Orb Recoil.
252+ Atk Miracle Seed Rillaboom Wood Hammer vs. 0 HP / 0 Def Mew in Grassy Terrain: 325-384 (95.3 - 112.6%) -- guaranteed 2HKO
252 Atk Victini V-create vs. 0 HP / 0 Def Mew: 246-289 (72.1 - 84.7%) -- guaranteed 2HKO
252+ Atk Iron Fist Melmetal Double Iron Bash (2 hits) vs. 0 HP / 0 Def Mew: 278-330 (81.5 - 96.7%) -- approx. 2HKO
It is also a very good partner with Kart, as Kart is able to knock off torn and make it vulnerable to stealth rocks, which enables Rillaboom to deal massive damage with this combination of moves.
252+ Atk Miracle Seed Rillaboom Wood Hammer vs. 252 HP / 88 Def Tornadus-Therian in Grassy Terrain: 176-207 (48.6 - 57.1%) -- guaranteed 2HKO after Stealth Roc
So Rillaboom can click Grassy Glide and pick up the KO, and even if Torn switches out, they'd leave without defogging, putting them in range of Kartana.
252+ Atk Miracle Seed Rillaboom Grassy Glide vs. 252 HP / 88 Def Tornadus-Therian in Grassy Terrain: 102-121 (28.1 - 33.4%) -- 0.1% chance to 3HKO