This u?cinderace is a bad example since it barely sees play.(its usage is only 2.18%).
even if garganacle hits it,it still can't kill it since corviknight can just switch.
rotom-w is an electric type meaning that if corviknight switches to a ground type your attack will be wasted.(if that ground type is water absorb clodsire then rorom-w is completely walled.).
iron-valiant faces the same problem as the rotom-w except that it will not get walled by clodsire
and as for iron moth and skelledigre....well... the corviknight can just switch to something else.