http://thpp.supersanctuary.net/wiki/Attack_Remilia
Typing:
Dark/
FlyingAbilities: Keen Eye/Pressure
Hp:75
Atk:135
Def:60
SpAtk:90
SpDef:70
Spd:120
4x dream resistance, immunity to ghost and earth, amazing offensive stats and near perfect coverage in 2 moves. Attack Remilia is just insanely good at punching holes in teams and can even clean up late game once those pesky blade flash users are out of the way. Seriously, think staraptor with Zam stats and no rock weakness. Then make it better. Thats how good remi is.
ChoiceAttack Remilia @ Special Bloomers
Ability: Keen eye
Ev's: 252 Atk/ 252 Spd/ 4 Hp
Nature Jolly (+Spd/-SpAtk)
-Soar
-Thrash
-Superpower
-Fire punch
Soar/Thrash is an amazing stab combination resisted by a mere handful of puppets all of whom are hit neutrally by superpower so I got a bit lazy with the last moveslot, fire punch hits Yumeko slightly harder than superpower on the switch but honestly you can run whatever here. Usage is simple, swap in on one of Remilia's myriad resistances or immunities and fire off hay-maker blows until the opposing defensive core just cant take it anymore. Legit hole puncher is legit
Counters: Yumeko, and Rika are easily Remilia's best counters as they can soak any hit Remilia has and threaten her out with a nasty 4x effective steel move, Ghosts can come in on thrash and blade flash will always kill Remilia making her a breeze to revenge or force out.
Support: Due to her hit and run nature Remilia wants a solid core to retreat into. Spikes are always useful as all of Remilias counters lack reliable recovery and para support can further limit her counters. Furthermore Remilia can pick up a baton passed tailwind or swords dance boost on a non choice set after your opponents blade flasher dies and sweep.
Options: You can lose the band and run a type item/lum + roost, or taunt, in the last spot to swap moves around and gain utility, Lum+ taunt makes a legit antilead, roost,taunt can wall break like nobody's business and thanks to her "ok" 90 special attack Remilia has the option of going mixed on her last move to maim her few counters on swap in. I would post these as separate sets (or add them to the main set) but that would get super redundant or super confusing very quickly as your only changing 1 or 2 moves and possibly using a hasty nature over jolly.
Note: Attack Remilia's alternate sets are by no means bad or suboptimal (unless its nasty plot A remi, then yes it sucks) choice is simply the set with the most raw power.