XY RU LEGALIZATION
-Parenthesis indicates moves/abilities/Mega Evolutions exclusive to ORAS that were not available in XY.)
-(N/A) indicates no new moves/abilities/Mega Evolutions were added in the XY-ORAS transition.

S Rank
Abomasnow-Mega (N/A)
Moltres (Flame Body Ability)
Meloetta (N/A)

A+ Rank
Cobalion (Zen Headbutt)
Cresselia (N/A)
Doublade (Magnet Rise, Snore, Shock Wave, Spite, After You)
Gligar (N/A)
Reuniclus (Iron Defense)
Sharpedo (N/A)
Slowking (N/A)

A Rank
Alomomola (N/A)
Aromatisse (Covet, Magic Coat, Snore, Heal Bell, Drain Punch, After You, Helping Hand, Endeavor)
Drapion (Iron Tail)
Druddigon (N/A)
Fletchinder (Tailwind, Snore, Heat Wave, Snatch)
Hitmonlee (Focus Punch)
Rhyperior (N/A)
Spiritomb (N/A)
Virizion (N/A)

A- Rank
Clawitzer (Bounce, Icy Wind, Aqua Tail, Iron Tail, Snore, Helping Hand)
Delphox (Covet, Signal Beam, Low Kick, ThunderPunch, Fire Punch, Foul Play, Zen Headbutt, Dazzling Gleam, Iron Tail, Snore, Shock Wave, Trick, Wonder Room, Recycle, Snatch, Skill Swap)
Dugtrio (N/A)
Durant (N/A)
Escavalier (Signal Beam)
Exploud (N/A)
Jolteon (N/A)
Magneton (N/A)
Registeel (N/A)
Shiftry (N/A)

B+ Rank
Accelgor (N/A)
Audino (No Audinite)
Amoonguss (N/A)
Braviary (Zen Headbutt)
Eelektross (Focus Punch, Shock Wave, Dragon Pulse, Outrage)
Gurdurr (N/A)
Kabutops (N/A)
Omastar (N/A)
Rotom-Mow (N/A)
Qwilfish (N/A)
Skuntank (N/A)

B Rank
Bronzong (N/A)
Combusken (Pre-BP Complex Ban)
Emboar (Reckless Ability, Zen Headbutt)
Golbat (N/A)
Heliolisk (Signal Beam, Low Kick, ThunderPunch, Fire Punch, Magnet Rise, Electroweb, Dragon Pulse, Hyper Voice, Iron Tail, Snore, Shock Wave)
Lanturn (N/A)
Mesprit (N/A)
Sigilyph (N/A)
Tangrowth (N/A)
Weezing (N/A)
Whimsicott (N/A) 
Togetic (N/A)

B- Rank
Archeops (N/A)
Banette-Mega (N/A)
Cinccino (N/A)
Gallade (N/A)
Gastrodon (N/A)
Gorebyss (Pre-BP Complex Ban)
Granbull (Focus Punch)
Hitmontop (N/A)
Kricketune (N/A)
Mismagius (N/A)
Sawk (Focus Punch)
Seismitoad (Focus Punch, Water Pulse)
Slurpuff (Covet, Magic Coat, Snore, Heal Bell, Drain Punch, Gastro Acid, After You, Helping Hand, Endeavor)
Xatu (N/A)
Zangoose (N/A)

C+ Rank
Cofagrigus (N/A)
Cradily (N/A)
Dragalge (Adaptability Ability, Bounce, Gunk Shot, Icy Wind, Iron Tail, Snore, Shock Wave, Water Pulse, Outrage)
Gourgeist Small (Synthesis, Foul Play)
Gourgeist XL (Synthesis, Foul Play)
Liepard (N/A)
Piloswine
Regirock
Roselia
Rotom-F
Sandslash
Sneasel
Torterra
-Tyrantrum (Pre-Rock Head and Tutor Moves, Superpower etc)
Uxie
Vivillon

C Rank
Bouffalant (N/A)
Chatot (No Heat Wave + Boomburst combo, Boomburst is an XY Egg Move, and there is no way for Chatot to learn Heat Wave through breeding or through leveling up in XY)
Feraligatr (Sheer Force Ability)
Ferroseed (N/A)
Jynx (N/A)
Meowstic-Male (Signal Beam, Magic Coat, Gravity, Zen Headbutt, Iron Tail, Snore, Heal Bell, Shock Wave, Trick, Magic Room, Wonder Room, Recycle, Snatch)
Miltank (N/A)
Pangoro (Covet, Dual Chop, Iron Head, Low Kick, Gunk Shot, Uproar, ThunderPunch, Ice Punch, Fire Punch, Block, Superpower, Zen Headbutt, Hyper Voice, Snore, Knock Off, Drain Punch, Focus Punch, Spite, Helping Hand, Endeavor, Outrage, Snatch)
Pelipper (N/A)
Rotom (N/A)
Sceptile (Dual Chop)
Steelix (N/A)
Tauros (N/A)

C- Rank
Abomasnow (N/A)
Arbok (N/A)
Barbaracle (Dual Chop, Low Kick, Earth Power, Iron Defense, Superpower, Icy Wind, Snore, Water Pulse, Endeavor, Stealth Rock)
ROCK WITH EYES (Covet, Magic Coat, Earth Power, Gravity, Iron Defense, Snore, After You, Wonder Room, Skill Swap)
Ditto (N/A)
Lickilicky (N/A)
Jellicent (N/A)
Ludicolo (N/A)
Pyroar (Bounce, Iron Tail, Snore, Heat Wave, Helping Hand, Endeavor)
Rotom-S (N/A)
Swellow (N/A)

D Rank
Ambipom (N/A)
Cacturne (N/A)
Exeggutor (N/A)
Hippopotas (N/A)
Mr. Mime (N/A)
Lilligant (N/A)
Linoone (N/A)
Mightyena (N/A)
Pawniard (N/A)
Poliwrath (N/A)
Scyther (N/A)
Stoutland (N/A)
Stunfisk (N/A)
Victreebel (N/A)
Zweilous (N/A)

E Rank
Claydol (N/A)
Hitmonchan (N/A)

UNAVAILABLE ITEMS
Glalitite
Audinite
Cameruptite
Custap Berry

ERRORS IN ORIGINAL DOCUMENT
Aurorus: Uh, not actually listed anywhere on the document. Unsure of what to do with this one. Aurorus's information is listed below.
Aurorus (Iron Head, Earth Power, Iron Defense, Aqua Tail, Zen Headbutt, Hyper Voice, Iron Tail, Snore, Water Pulse, Outrage, Stealth Rock) 
SOURCES
https://pokemondb.net/pokedex/
-Used for cross referencing BW2 move tutor moves.
https://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_with_released_Hidden_Abilities_(Generation_V)
-Used for determining if a gen 1-5 Mon had it's hidden ability or not. Oddly enough, never came in handy once.
https://serebii.net/pokedex-xy/
-Used to determine availability of hidden abilities for XY Mons.
https://www.serebii.net/xy/items.shtml
-Used to determine available items. Also went unused.