Pokemon Classes

What are the Classes of Pokemon and what are the differences between them?

Following are the classes of Pokemon currently available and their abilities

	Normal pokemon do not have any special ability.
	Shiny pokemon have 25% more HP.
	Dark pokemon have 25% more attack power.
	Ghostly pokemon can scare the opponent. (this is similar to flinching)
	Metallic pokemon are immune to status ailments (e.g sleep,burn,freeze, poison etc.)
	Shadow pokemon disable the ability of Metallics and Ghostlys. (i.e, Ghostlys cannot make Shadow pokemon flinch. Shadow pokemon can cause status ailments to Metallic pokemon).
	The ability of Mirage pokemon changes depending on the opponent pokemon's class. 20% more attack against Dark. 35% more attack against Chrome. Gains 20% HP against Shiny. Copies the ability of Ghostly and Metallic pokemon when fighting against them. On facing Shadow pokemon, it transfers all its ailments to the opponent (if your pokemon is poisoned, it heals itself and poisons the opponent). Mirage pokemon lose 10% health against normal pokemon.
	Chrome pokemon get 35% more HP. And 50% higher chances of a critical hit.
	Negative pokemon will have inverse type matchup in regular battle. And regular type matchup in inverse battle. See Inverse Type Chart for reference.
	Retro pokemon are practically the same as Normal pokemon. Although they are incredibly rare. They are meant to be a collector's item.

Why do Mirage Pokemon have a weakness?

This was added with Live Battle in mind. It attempts to create a sort of rock-paper-scissor effect, where no one particular type is the best. What matters is how and when you use them.

How common are these Pokemon Classes?