I have been on Cactuar Island and they always run I HATE THEM...

You can't really make them stay. All you can do is junction stuff to your speed or hit% stats; either will help tremendously. Squall pretty much has a 255 hit% naturally, so he'll always hit them, and you can junction Triple to everybody else's (or Double if you don't have that) to keep them from missing, and then you'll get a satisfactory amount of AP from each battle.

Also, be sure to equip "Initiative". Squall, with almost every weapon, should be able to destroy them.

I also let Rinoa call her dog, Angelo, as his "Angelo Cannon" did 1500+ HP of damage, resulting in instant kills. Angelo Cannon hits all enemies. I am level 15 with Squall, so maybe that's why Angelo can kill them with his Angelo Cannon.

I haven't tested it, but you might be able to put a whole group to sleep by using Quistis's Bad Breath Limit.

Simply enter the battle with Quistis on Initiative and spam the O button until you get her limit break and select bad breath.

For her to learn bad breath, you can card mod a couple Marlboros.

Cactaurs have an 80% chance (according to BradyGames guide) of falling asleep.

Talk dirty to them...that's what they like ;)

LOL, my cousin got in trouble while fighting a jumbo cactuar. He was about 12-13 years old battling a cactuar when it ran away...and just as his dad walks in the door I remember him saying "Fuck you, fuck you, and fuck you some more!"

Priceless moment.

Ubiješ ih prije nego pobijegnu, i dobro... Neznam kak ti se opće dalo pitat.