Some of my favorite niche ADV moveset:
Swampert (M) @ Salac Berry
Trait: Torrent
EVs: 4 Def / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Surf / Hydro Pump
- Ice Beam
- Substitute
- Endeavor
Swampert is usually used for its defensive abilities. This one however fits physical offensive team pretty well. Under sandstorm, it can kill (or even weaken) one or two Pokemon (depending on the situation/how much your opponent fucked up) and those are usually troublesome to deal with for offense (Bulky Water/Snorlax). Torrent boosted Surf/Hydro Pump hits hard. Its natural bulk is useful to take one hit or two against offensive team from the like of Metagross, Tyranitar or Salamence but don't overrate it, the lack of defensive EVs really makes it frail and it won't switch-in more than once (or maybe twice).
As for the downsides, it has some hard counters like Starmie, Roar Cune (if it comes when you're full health) and Dugtrio is still faster even at +1.
Umbreon @ Taunt/Mean Look/Baton Pass/Wish
One of the
reyscarface favorite: TrapPass Umbreon. There is very little you can do about it when you run an (and they are often) unprepared defensve team. A bit underwhelming against Offense. Can 6-0 really easily with the right partners (hi DD Taunt Ttar).
Sub/CM/Roar Suicune (with max HP and enough speed to outRoar the other Cune at the very least) is really strong and win games by itself when pulled off at the right time.