Location
	You can find this prickly guy on the Cactuar Island, south of the Esthar continent. He cannot be reached until you get the Ragnarok. You can easily spot him appearing and disappearing on his island.

Jumbo Cactuar
	Elemental: None
	Attack: 1,000 Needles
	Level		HP		Atk. Power
	1		-		-
	10		-		-
	20		1766		2000
	30		2536		3000
	40		3314		4000
	50		4100		5000
	60		4894		6000
	70		5696		7000
	80		6745		8000
	90		7324		9000
	100		8150		10000

Ability	AP	Opens		Ability	AP	Opens
EVA-J	200	EVA+30%		Move-HP Up	200	None
Luck-J	200	Luck+50%		HP Bonus	Learned	None
Magic	Learned	None		STR Bonus	Learned	None
GF	Learned	None		VIT Bonus	Learned	None
Draw	Learned	None		MAG Bonus	Learned	None
Item	Learned	None		SPR Bonus	Learned	None
Defend	100	None		Auto-Potion	150	None
Kamikazi	100	None		Expendx2-1	250	None
EVA+30%	150	Expendx2-1		GFHP+10%	40	GFHP+20%
Luck+50%	200	None		GFHP+20%	70	GFHP+30%
Initiative	160	None		GFHP+30%	140	None

The Jumbo Cactuar is a very powerful GF. The damage that is inflicted is 1,000 Pt's times the level it is currently on. So at level 100, the Jumbo Cactuar can do 10,000 points damage. This also cannot be blocked by any defenses or reflected.
If you can get this guy early enough, his plethora of Bonus abilities will allow you to make awesome fighters.
Also, Cactuar is the only GF to offer Luck and EVA-J. Add this with the EVA and Luck+ abilities, and you will not get hit too often, and your chances of Odin/Gilgamesh, stealing rare items, Etc. will go up.
It is also a nice addition to have another initiative.