I'll help:
"Gardevoir has the ability to read the future. If it senses impending danger to its Trainer, this Pokémon is said to unleash its psychokinetic energy at full power."
(Ruby/Omega Ruby)
"It will try to guard its trusted Trainer with its life. It has the ability to see the future."
(Diamond/Pearl)
"To protect its Trainer, it will expend all its psychic power to create a small black hole."
(Platinum/Black/White/Black 2/White 2/X/Shield)
"It has the power to predict the future. Its power peaks when it is protecting its Trainer.
(Y)"
"It will dedicate itself to defending a master it has come to adore. Its pure white dress, reminiscent of those worn by ladies of nobility, is the dress of one who is willing to risk their life."
(Legends)
Situation number one: (For those who chose Gardevoir)
Gardevoir will create a black hole and then use its Psychic energy to slaughter the ceratopsian
Situation number two (For those who chose Styracosaurus):
"One look at Styracosaurus and the message was clear: Back off, buster! With its spiky armor, this dinosaur, a cousin of Triceratops, forced predators as ferocious as T-Rex to think twice before attacking. Styracosaurus likely traveled in herds that could number several hundred, a mass of these creatures could create a gigantic spiked barricade if trouble approached"
"If attacked by a large predator, Styracosaurus could put its long nose-horn to work. While the attacker struggled with the horns around the dinosaur's neck-frill, Styracosaurus would just have to lift its head to a deal a crippling stab to its enemy. T-Rex, no doubt, sometimes made this fatal mistake"
(Weird n' Wild Creatures)
Styracosaurus goes stabby stabby with tons of gore into Gardevoir's body
Gardevoir
Styracosaurus
