Eevee: Xinhai chose Pokémon with the Technician and Adaptability Abilities for it.
Eevee's move pool was unfathomably deep. It had mastered a vast number of moves of different Types and varying power. The Technician Ability could help it grasp the essence of those moves more quickly and enhance the effects of low-power moves.
Adaptability, meanwhile, could strengthen its resonance with its own Normal-type moves. Even without evolving, it could unleash astonishing Normal-type power.
Eevee's training regimen was the most complicated. It had to take turns using various low-power moves, such as Quick Attack, Helping Hand, and Covet, striving for ultimate control and seamless transitions on specially made move targets while sensing the subtle changes in energy output.
Sandile: Xinhai chose Intimidate and Mold Breaker for it, two Abilities more inclined toward the mental aspect.
Combined with its existing Moxie Ability and the Intimidate Ability it had trained previously, Intimidate could further amplify its mental deterrence against opponents, making them endure greater psychological pressure and mental strain when using moves.
Mold Breaker, on the other hand, could train its mental penetrating power, allowing its moves to more easily break through an opponent's Ability-based defenses while ignoring the opponent's Ability to a certain extent.
Sandile's training involved directly facing Pokémon in the Ecological Park that possessed Intimidate, Unnerve, and similar Abilities, enduring their mental intimidation, then attempting to break through their mental defenses with moves such as Leer and affect their condition or abilities.
Mightyena: for one with the Intimidate Ability, the best path was to combine it with two similar Abilities, Intimidate and Unnerve.
Combined with Mightyena's own Intimidate Ability, the goal was to turn it into a battlefield suppressor that crushed the opponent's will to attack, disrupted their mindset, and made them timid and unable to fight at full strength.