Horse-Archers, nuff said :P

in general when having pikes its just forward forward forward! and catch them before they split formation and then use cavalry simplesimplesimple

if you have hoplites, use 1 hoplite as an "anvil" put it in guard formation and they will take very few casualties and use slingers from behind to drop morale and numbers, optional: use hippakontistai for the same task as the slingers and ofcourse cutting down routers