Once Aya has more than six they will be constantly rotated (because he feels that will be the fair thing to do). So the ones he has currently are listed here:
Eevee --> Umbreon (9-1-2011) - Mercutio "Cu"
Obtained - April 3rd
Level - 65
Moves - Adaptability, Tail Whip, Tackle, Helping Hand, Sand-Attack, Growl, Quick Attack, Bite, Baton Pass, Take Down, Last Resort, Trump Card, Pursuit, Confuse Ray, Faint Attack, Assurance, Mean Look, Screech
Eevee --> Espeon (9-30-2011) - Bianca "Bi"
Obtained - April 25th
Level - 58
Moves - Adaptability, Tail Whip, Tackle, Helping Hand, Sand-Attack, Growl, Quick Attack, Bite, Baton Pass, Take Down, Last Resort, Trump Card, Confusion, Swift, Psybeam, Future Sight, Psych Up
Eevee - Cassio "Cas"
Obtained - May 1st
Level - 50
Moves - Adaptability, Tail Whip, Tackle, Helping Hand, Sand-Attack, Growl, Quick Attack, Bite, Baton Pass, Take Down, Last Resort
Eevee - Lysander "Ly"
Obtained - June 7th
Level - 75
Moves - Adaptability, Tail Whip, Tackle, Helping Hand, Sand-Attack, Growl, Quick Attack, Bite, Baton Pass, Take Down, Last Resort, Trump Card
Eevee - Diana "Di"
Obtained - July 4th
Level - 45
Moves - Adaptability, Tail Whip, Tackle, Helping Hand, Sand-Attack, Growl, Quick Attack, Bite, Baton Pass
Eevee - Aegeon "Geo"
Obtained - July 4th
Level - 40
Moves - Adaptability, Tail Whip, Tackle, Helping Hand, Sand-Attack, Growl, Quick Attack, Bite, Baton Pass
Eevee - Demetrius "Dem"
Obtained - July 16th
Level - 36
Moves - Adaptability, Tail Whip, Tackle, Helping Hand, Sand-Attack, Growl, Quick Attack, Bite, Baton Pass
Vulpix --> Ninetales (9-20-2011) - Ophelia "Lia"
Obtained - April 25th
Level - 60
Moves - Flash Fire, Flare Blitz, Ember, Tail Whip, Roar, Quick Attack, Fire Spin, Confuse Ray, Imprison, Flame Burst, Safeguard, Will-O-Wisp, Payback, Flamethrower, Captivate, Inferno, Grudge, Extrasensory, Fire Blast, Nasty Plot
Natu - Othello "Lo"
Obtained - June 1st
Level - 45
Moves - Synchronize, Peck, Leer, Night Shade, Teleport, Lucky Charm, Miracle Eye, Me First, Confuse Ray, Wish, Psycho Shift, Future Sight, Stored Power, Ominous Wind
Mawile - Adriana "Ria
Obtained - July 6th
Level - 30
Moves - Astonish, Fake Tears, Bite, Sweet Scent, ViceGrip, Faint Attack
[Updated October 9th, 2011]