Pokemon XY team theme ideas.?

So I'm planning on making a monochrome themed team (like black and white colored Pokemon) but the problem is there's not enough Pokemon that fit the common roles of competitive battling.

The Pokemon I plan on using were these:

Phys Sweeper: Scrappy Pangoro (if I can find one) or Absol (with mega stone if I swap Gardevoir)

Special Sweeper: Shiny/non shiny Mega Gardevoir or Zoroark (if I can't get the HA pancham to breed it)

Mixed Sweeper: Togekiss

Phys Wall: ???

Special Wall: Umbreon.

Status/Support: ???

This is where I'm stuck. I can't find Pokemon that would fit the theme and also fill those roles. Either some white colored or black colored Pokemon for those roles (well, a majority of the Pokemon needs to be that color, like how Togekiss is mostly white with some red and blue).

I'd like to limit the number of Legendaries to those that can be used, so only the ones that make it past the official ban list. They don't have to be type specific, just need to be those two colors, though gray would be a "last resort" type of thing.

The reason is because I (someday) would like to be one of those "gym leaders" from those Pokemon tournaments or convention things and I wanted my theme to match my in-game character's outfit (like how most other gyms in the game are).