help making final picks

ive narrowed down the majority of my team but im having difficulty filling in the last gaps, team is for competitive use, doubles and singles in rating battles in ORAS. So far minus movesets and EVs to keep it simplified i have,

Gardevoir-most likely my mega
Greninja with protean
Landorus-T with intimidate
Rotom wash-levitate


and heres where it drops off. i have ideas of using scizor, talonflame, charizard, venesaur, salamence, metagross or even chandelure. problem is i cant decide what combo for the remaining two slots would probably work out the best. any help?

currently feeling scizor and mence or mence and venusaur

you can have a really nice volturn with Lando T / Rotom / Talonflame. Talonflame and rotom are IIRC a good core as they have cover each other weaknesses and keep momentum. Plus I can see talonflame adding 2 great stabs to your team with fly + fire.

Just use Scizor + Salamence only in Battle Spot formats, as regular Salamence is subpar. Regular Venusaur isn't worth it unless you pair it with a Drought user.

Anyway, here are the best sets for each:

Gardevoir:
-Psyshock
-Hyper Voice
-Focus Blast
-Taunt/Will-o-Wisp/Calm Mind
Nature: Timid/Modest
EVs: 24 Def/232 SAtk/252 Spe
Item: Gardevoirite
Ability: Trace

Greninja:
-Hydro Pump/Low Kick
-Ice Beam
-Gunk Shot
-Dark Pulse/Hidden Power (Fire)/Grass Knot
Nature: Naive
EVs: 40 Atk/216 SAtk/252 Spe
Item: Life Orb
Ability: Protean

Therian Landorus:
-Earthquake
-Stone Edge
-U-turn
-Knock Off/Superpower/Explosion
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Scarf

or
-Stealth Rock
-Earthquake
-Stone Edge/Rock Slide/Knock Off
-U-turn
Nature: Impish
EVs: 252 HP/240 Def/8 SDef/8 Spe
Item: Leftovers/Rocky Helmet

or
-Stealth Rock
-Earthquake
-Stone Edge/Knock Off
-U-turn/Explosion
Nature: Adamant/Jolly
EVs: 72 HP/252 Atk/184 Spe
Item: Focus Sash/Earth Plate/Soft Sand

or
-Swords Dance
-Rock Polish
-Earthquake
-Stone Edge
Nature: Adamant
EVs: 56 HP/220 Atk/232 Spe
Item: Leftovers/Soft Sand/Earth Plate

or
-Substitute
-Swords Dance
-Earthquake
-Stone Edge
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Salac Berry

Wash Rotom:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Rest
Nature: Bold
EVs: 248 HP/252 Def/8 Spe
Item: Leftovers/Chesto Berry

Scizor:
-Swords Dance
-Bug Bite
-Bullet Punch
-Superpower
Nature: Adamant/Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Lum Berry
Ability: Technician

or
-U-turn
-Bullet Punch
-Superpower
-Pursuit/Knock Off
Nature: Adamant
EVs: 248 HP/252 Atk/8 SDef
Item: Choice Band
Ability: Technician

Salamence:
-Dragon Dance
-Return/Double-Edge
-Earthquake
-Fire Blast
Nature: Naive
EVs: 252 Atk/4 SAtk/252 Spe
Item: Salamencite
Ability: Intimidate

or
-Dragon Dance
-Return
-Substitute
-Roost
Nature: Adamant
EVs: 168 HP/92 Atk/88 SDef/160 Spe
Item: Salamencite
Ability: Intimidate

or
-Draco Meteor/Roost
-Hyper Voice
-Fire Blast
-Hydro Pump
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Salamencite
Ability: Intimidate

or
-Draco Meteor
-Double-Edge
-Earthquake
-Fire Blast
Nature: Naive
EVs: 188 Atk/68 SAtk/252 Spe
Item: Salamencite
Ability: Intimidate