The is nothing else to really do. The seven sages were basically the final mission.
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i have been on several official cites looking for this including Pokemon wiki and serebii they list how to find the seven sages but not ghetesis so i think you cant sorry
After you have Looker arrest the last sage out of the Seven Sages, He should thank you and he should also tell about a boy who sounds exactly like N, who has been seen with a dragon pokemon somewhere far away... ^_^
That is not really a question to ask but if you asked who is ghetsis he is one of the seven sages in Pokemon black and white.
he/her is in white forest at level 5 but you have to find all the seven sages then once you have done that so of the grass in white forest will become water. Surf on the water and you will find him soon.
u can find the six sages on route 18, dreamyard, relic castle, cold storage, chargestone cave, and route 14 hopes this helps bye