Looking for a 6 Team Member

[GalaticNeon]

I need help to figure out what my 6 pokemon should be and also what moves and items my pokemon should have. The only pokemon that are ready are Greninja and Rotom.

Greninja @ Life Orb
Ability: Protean
Nature; Timid
Shiny; Yes
- Ice Beam
- Hydro Pump
- Dark Pulse
- Protect

Rotom Wash @Sitrus Berry
Ability; Levitate
Nature; Calm
Shiny; No
- Hydro Pump
- Volt Switch
- Will-O-Wisp
- Shadow Ball / protect

Landorus T @ not sure
Ability; Intimidate
Nature; Hardy
Shiny; No
-?
-?
-?
-?

Talonflame @ Not Sure
Ability: Gale Wings
Nature: Adamant
Shiny: No
-?
-?
-?
-?

Gallade @ Mega-Stone
Ability: Steadfast
Nature: Modest
Shiny: No
-?
-?
-?
-?