I gathered this data from a table from a Japanese site. This shows the effects and triggering conditions of the various battle specials. This is reprinted without the permission of the source site. In any case, I'll give full credit to the following site for this info:

https://www.kuri.sakura.ne.jp/~monster/

Prequisite: Certain Special may only be used by monsters of certains breed or specific natures
Trigger: The Special has a random chance of occuring if this condition is met.
Good Effects: Self explanatory
Bad Effects: Ditto
# of uses: This is the number of times the Special may be triggered in a fight.

Name	Prerequisite	Trigger	Good Effects	Bad Effects	# of uses
Power	Good Nature	Monster hit when under 50% LIF(?)	Damage +100%	(None)	more than once per battle*
Anger	Bad Nature	Monster hit with Withering attack	Withering +100% Guts Regen +50%	Evasion -50%	Unlimited
Grit	(none)	Monster is KO'ed	Recover from KO with 1 LIF	(none)	Once per battle
Will	(none)	Monster uses move while at 99 Guts	Accuracy +100%	Guts Used +50%	Unlimited
Fight	(none)	Opponent's Guts reaches 99	Monster gains Guts equal to damage taken if attacked	(none)	Unlimited
Fury	(none)	Monster is attacked while moving	Damage +100% Withering +100%	(none)	Unlimited
Guard	(none)	Monster is hit 3 times in succession	Damage Taken -30% Guts Regen +50%	Damage -50%	Unlimited
Ease	(none)	Dodge or Succeed with an attack 5 times in succession	Evasion +100% Guts Costs -30%	Damage Received +100%	Unlimited
Hurry	(none)	Fewer than 10 seconds remaining on timer	Critical Hit rate + 100%	(none)	Lasts until end of battle
Real	Jokers and Joker sub-breeds only	Opponent's LIF is less than 25% of maximum	Withering +50% Critical Rate +50% Guts Regen +50 Damage Taken -30% Guts Damage Taken -30% Arena Movement Speed increased	Reverse of benefits apply if REAL wears off	Until end of battle
Vigor	(none)	Monster succeeds with attack with less than 5 seconds elapsed on timer	Arena Movement Speed increase	(none)	Unlimited
Unity	Color Pandora breeds only	Monster fails with an attack 5 times in succession or if hit 5 times in succession	increase arena move speed	lowers guts regen	Unlimited

Disclaimer: The info posted in the above chart may not be 100% accurate. It will be updated if new info is uncovered.

* Japanese site says only once per battle, but numerous users on MRM have seen it twice in one battle.
* ColorPandora info thanks to Bill Fbgame.

How about adding Dadge's "Analysis" and what battle effect it corresponds to?

Poison is supposed to be the equivilant of the pixie/joker only in sub-breed form. Yep seen power more than once. Everything else looks right.

I can't remember all of the quotes verbatim but here goes:

POWER - "You won't see it's true abilities until it's cornered"

ANGER - "It becomes easily enraged"

GRIT - "Giving up is not in its nature"

WILL - "Its senses are very keen."

FIGHT - "It is very passionate."

FURY - "It goes completely out of control when it's angered"

GUARD - "It knows how the endure hardships."

EASE - "It appears confident."

HURRY - "It doesn't give up until the last moment."

REAL - "It tends to hide it's true abilities."

VIGOR - "It tends to become elated."

UNITY - "They are three but have one mind."

we have fought an end bringer against a skeleton, the skeleton has slower guts. with the same stat gains as a henger/joker, but slower guts leads me to belive that skeleton is really a garlant (henger/dragon) that just has Real.