Try this set it will trap your opponent completely!
Ok so have a Poke'mon with this moveset:
- Roost
- Feather Dance
- Sucker Punch
- Taunt
And this set:
- Mean Look
- Psychic (Your Choice.)
- Heal Pulse
- Earthquake
Set one Strategy:
Here is how you use it Start up with a use Taunt Attack to Make the opponent use offensive moves for sure, Then, use a Feather Dance to lower it's Attack, After that, use a Sucker Punch that is sure to hit, (With alot of Power!). Roost is to heal all the damage it's taken while doing this. Keep doing this for Ultimate power! Try out an Metronome or a Leftovers as an item.
Set two Strategy:
Heal Pulse Just in-case team-mate needs help.
Mean Look Keeps the opponent from switching out & ruining this combo.
Earthquake Covers The Electric Weakness the Flying Poke'mon Team-Mate
has. Psychic is STAB to Gallade.
Needed Poke'mon:
(Set 1.)

Murkrow or Honchkrow
Needed Poke'mon:
(Set 2.)

Gallade
Hope I Helped! ^_^