Meteor Mission 5 ability update, also 4 because I forgot
Majin Ozotto
Hehe... I'll have some! (MM4-SEC2) - Massive Power theft and instant HP reduction shortly into the battle, sadly neutered by reliance on game mechanics.
Invitation to the Palace (MM5-062) - He gets to start the battle by increasing his own energy and decreasing the enemies'. The amounts depend on the difference in numbers between the sides, higher if the difference is lower. Temporary power null also gets added in if both sides are equal, which is obviously useful for 1v1s.
Majin Ozotto (with Gohan absorbed)
Ominous Ultimate Power (MM4-067) - If someone he's fighting tries to increase their damage reduction, Ozotto removes it and also seals their special attacks.
Transforming Majin's Kamehameha (MM4-067) - Ozotto does a Kamehameha. If he pulls it off, his attacks will forever ignore the enemy's defense stat.
Giant Majin Ozotto
Gluttonous Giant (MM4-SEC2) - His special attacks as a Giant have a flat 5,000 damage boost, and he steals half the Power of the people he hits with them.
Horrifying Majin Giant (MM5-062) - His special attacks as a Giant deal more damage when the enemy doesn't have much energy.
Hearts
Super Hearts' Counterattack (MM5-058) - He starts the battle with his strength and defense stats doubled. He also can't be stunned, but he already has that from Adrenaline Rush. Both his strength stat and his raw damage are doubled each time someone attacks him.
Devastating Key Sword Lock (MM5-058) - This is the big one. You should know what having this ability means for Hearts.
The Future in His Grasp (MM5-059) - When he's attacking, and his side's attackers outnumber the enemies', his team ignore defense and damage reduction. When he isn't attacking, and the enemies' attackers outnumber his side's, he seals the special abilities of the three strongest people on both sides.
Lagss
Skilful Guidance (MM5-057) - When she isn't attacking, she can reduce the damage taken by Hearts. Him specifically, nobody else.
Virtual Image of Glass (MM5-059) - When she's attacking, her allies deal more Stamina damage to the enemy who can do the most damage. When she's not attacking, and at least two of her allies are being attacked at the same time, the ally who will take the least damage has their Stamina protected during that attack(s).