Thunderhouse
Left (Gyarados) (F) @ Lum Berry
Trait: Intimidate
EVs: 252 Atk / 128 Def / 128 Spd
Jolly Nature (+Spd, -SAtk)
- Dragon Dance
- Waterfall
- Ice Fang
- Earthquake
Mid (Mantine) (F) @ Leftovers
Trait: Water Absorb
EVs: 128 HP / 252 Def / 128 Spd
Timid Nature (+Spd, -Atk)
- Tailwind
- Confuse Ray
- Icy Wind
- Scald
Right (Rhydon) (F) @ Eviolite
Trait: Lightningrod
EVs: 128 HP / 128 Def / 252 SDef
Careful Nature (+SDef, -SAtk)
- Icy Wind
- Protect
- Earthquake
- Rock Slide
Gyarados out speeds everything from 1/2 boost speed from dragon dance and a tailwind.
Mantine is the support, tailwind allows Gyarados, as stated before, to out speed everything. Rhydon can only outspeed a fourth of the metagames (awww... that sucks). Mantine can easily confuse the enemy with it's boosted speed and wind down foes so that once Tailwind pewters out, Mantine doesn't have to set it again and can scald it's way out.
Rhydon takes electric attacks and receives no damage, thus making Mantine and Gyarados only threatened by rock types, which they can easily kill with a water attack.
Import