Froslass @ Choice Scarf
Trait: Snow Cloak
Evs: 252 Spe/ 252 Sat/ 4 HP
Timid Nature
- Trick
- Hail
- Blizzard
- Shadow Ball
Froslass is a bit tricky, hence the move Trick. Trick+ Choice Scarf can cripple defensive Pokémon’s severely. Hail set up the hail obviously, and Blizzard>Icy Wind in the Hail due to the 100% accuracy. Shadow Ball is STAB.
Toxicroak @ Black Sludge
Trait: Anticipation
Evs: 252 Spe/ 252 Atk/ 4 HP
Jolly Nature
- Brick Break
- Poison Jab
- Substitute
- Sucker Punch
Brick Break and Poison Jab is good STAB whilst Substitute sets up. Sucker Punch is almost required on Toxicroak due to the 4x weakness to Psychic.
Latios @ White Herb
Trait: Levitate
Evs: 252 Spe/ 252 Sat/ 4 HP
Timid Nature
- Draco Meteor
- Psyshock
- Tailwind
- Thunder Wave
So this set is a bit different from most Latios. Draco Meteor+ Whit Herb is death incarnate to most teams. Psyshock is second STAB and hit Blissey and its likes really hard at the same time as Tailwind supports and Thunder Wave cripples.
Gliscor @ Leftover
Trait: Hyper Cutter
Evs: 252 HP/ 252 Atk/ 4 Spe
Adamant Nature
-U-Turn
-Earthquake
-Stealth Rock
-Substitute
Supportive Physical Tank Gliscor. U-Turn let you get momentum, Earthquake is STAB, Stealth Rock is support and Substitute is for stalling.
Empoleon @ Life Orb
Trait: Torrent
Evs: 252 Sat/ 252 HP/ 4 Spe
Modest Nature
- Surf
- Flash Cannon
- Grass Knot
- Aqua Ring
Surf and Flash Cannon is STAB, Grass Knot is coverage against Ground primarily whilst Aqua Ring let you take a few more hits.
Charizard @ Focus Sash
Trait: Blaze
Evs: 252 Atk/ 252 Spe/ 4 HP
Nature
- Fire Punch
- Dragon Dance
- Outrage
-Thunder Punch
Physical Charizard? Really? In fact, Dragon Dance Charizard is quite powerful. Fire Punch is STAB. Outrage is sheer power and Thunder Punch is coverage.
Overall, your team is quite weak to Stealth Rock, so maybe get a Rapid Spinner, such as Starmie or Kabutops. Sorry for the short descriptions but I was in a hurry. Hope it helped!