BW Ball: Has a 4x chance of capture against Pokemon in the Black or White Color Groups.
appearance: Simple black on top, white on bottom hemispheres. Vivid light blue equatorial.
Grey Ball: Has a 2.5x chance of capture against Pokemon in the Grey Color Group.
appearance: Solid Metal grey on both hemispheres, same vivid light blue originating pole to pole, with 8 lines of longitude.
I'm actually amazed they did not add anymore Poke Ball designs or opening sequences this gen. We had little stamp animations last generation, and that's always a nice touch for creativity.
I'd also recommend some move set additions...
Scolipede; Wild Charge, (either) Hone Claws or Coil, some way of getting U-Turn, Heavy Slam/Iron Head (it seems weird that it cannot get either), and HEAD SMASH! This thing is dying to wreck UU competitive play and any recoil move it can get it's hands on to put it in Swarm activation range, it needs. Also, centipedes are quite adapt at turning around quickly and running. I don't know if this was intentional, but come on! Of all the bugs to not get U-Turn... :/