Ny point in using Agility if your speed is already faster

Leveling does not directly affect a Pokemon's EVs (and therefore Super Training.) In prior generations (before V, I believe,) EVs were only calculated upon leveling, so a level 100 Pokemon could not be EV trained. Now, however, EVs are calculated after each battle (and probably between battles, in the case of Super Training.)

However, leveling via battle affects Super Training because it grants EVs based on the Pokemon fought. So leveling via rare candies won't affect super training, but leveling through battle will.

I believe that EXP Share grants EVs to all Pokemon—confirmed by UnderscoreZero in the comments.

Use a Skill swapping/changing move on each Pokemon of the horde in turn until you find one with the ability you want.

For example,

• Skill Swap - Swaps yours and the opposing Pokemon's Abilities
• Worry Seed - Sets the opposing Pokemon's Ability to Insomnia
• Entrainment - Sets the opposing Pokemon's Ability to your ability (unlike Skill Swap, it doesn't change yours).

Their Ability will briefly flash up on the screen (before changing to the new Ability), allowing you to tell which ability it carries normally. Don't worry, their ability will revert to the original at the end of the battle.

As for some Pokemon that have access to these moves:

• Sylveon learns Skill Swap on level 25, Carbink/Solosis on level 40
• Budew learns Worry Seed on level 16, Pumpkaboo on level 11.
• Pancham/Pangoro learn Entrainment on level 42/45 respectively,