Velites are perfect for it, and Hastati are good too.
Basically, since you're playing a faction with phalanxes they, by default, have very bad cav. This is perfect, as they will have no cav to attack your Velites or Hastati.
Bring up the Velites and start peppering them with volleys. Once they have run out of ammo get the Hastati up close. Bring your cav to the flanks and prepare to attack either the phalanxes or supporting archers.
When the Hastati are there bring them up close, let them fire a volley, but don't let them charge.
Now throw your poor Velites into the phalanx, on the flanks if possible. Now manouvre the Hastati and fire the last volley, and let them charge.
Now your cav has mopped up the last of the enemies archers and skirmishers bring them back. Group them into one massive group and charge them into the rear of 1 phalanx. As soon as it breaks don't botther chasing, but do the same to the phalanx next to it.
Continue doing that untill they are all broken. You'll lose alot of Velites and a reasonable amount of Hastati, but you'll win.
< Jarrod Nelson>
Nelson looks good in his pics - Gaurdian_112
Wow, Nelson's awfully cute... - HP Lovesauce
Thanks for ruining something that I've waited over 6 years for. - Redneck93
It might be a bit of an odd moment to say so, but I still think Nelson's smile is awesome. - Hnossa
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