Well.. hmm.. there are no cheats yet. There will be though. Anyway, here are the cactuars:
1 -> Lobivia: Bikanel Desert, Oasis
2 -> Toumeya: Besaid Island, Beach
3 -> Lobeira: Guadosalam Chateau, Ormi's Room
4&5 -> Areg & Arroja: Calm Lands, Gagazet Entrance
6 -> Islaya: Thunder Plains North, Near Tower 9
7 -> Chiapa: Kilika Island, Hidden Overlook (if you don't know this, just PM me, I'll explain to you where to go to)
8 -> Erio: Mt. Gagazet, Summit
9 -> Bartschella: Kilika Port, Dona's House

This should help alot!!! (Some names give them away : For example: Bartschella as in Bartello)