ITT: Create one new type. Explain what the type encompasses and how it's strengths/weaknesses make sense flavorwise. Bonus points for listing new/retyped moves or Pokemon.

I'll start with the obligatory one.

LIGHT
Deals with electromagnetic waves, reflection/refraction, wave optics, some radioactive decay, and very toned-down general relativity. Primarily focuses on speed, status, and support moves.

Pokemon are either light-themed animals (like Fire and Electric), mythical creatures with domain over light (angels, valkyries, rods, etc.), or something styled after an optical phenomenon (rainbows, mirrors/lens, mirages, bio-luminescence, etc.). Moves deal with things like difraction, signal interference, radioactive decay, time dilation, magnification, lasers, etc.

>Offense
x2 Electric (strong ionizing radiation damages electrical systems)
x2 Ghost (people are less afraid of well-lit places, thus leading to fewer supernatural fears)
x0.5 Ice (light is refracted)
x0.5 Light (superposition and interference)
x0.5 Water (same as Ice)
x0 Grass (photosynthesis)

>Defense
x2 Psychic (closest thing to gravity in Pokemon, and they desperately need a buff)
x0.5 Fire (radiation causes heat, among other things)
x0.5 Electric (see above)
x0.5 Light (see above)