I've thought of a similar notion, I called it Rift-Type. It is similar to cosmic in being mainly support moves. But the whole thing as a whole seems a bit overly complicated, and a little too specialized.
I tried to make it as un-specialized as possible, but still unique (as a support type). Its main focuses are
-- to nullify status changes.
-- to use the enemy's status changes against them.
-- to nullify field changes; to impose field support.
-- to inflict damage regardless of type-affiliation.
-- to prevent attacks or to lessen their impact; to decrease the efficiency of moves.
These roles fit a variety of uses and are attractive for a number of situations. While not particularly offensive, these roles still serve to have
some offensive possibilities. For example:
-- A move like Punishment that does damage based on the amount of power-ups the foe has.
-- A move that gains priority if your foe has stat-ups.
-- A move that switches stat ups and stat gains (probably a field move).
-- A move that does more damage when there are field effects up; clears field effects after.
-- A move that halves the foe's health.
-- A move that slows all Pokemon in play (but not those switched in later).
-- A move that does damage and prevents the user from being hit by Physical attacks that turn (low PP and low power for balance).
Attack names could be named "Momentum," "Inertia," etc.
The strategy would be to weaken the opponent so they are encouraged to set up on you, at which point your attacks also become more powerful.
