If you want a complete list of the changes, you can read it here!
Move Changes:
Draco Meteor, Overheat, etc: 120 BP, 100% acc, â…“ recoil, hits all adjacent foe
Knock off boosted to 65 BP
Guillotine buffed to 50% acc
Sheer Cold changes to be an absorption move, 80 BP 100% acc
Fissure: 110 BP 100% acc, recoil move, hits all adjacent foe
Featherdance: Changed to be a special dragon dance
Fang moves: Moved to 75 BP, 100% acc
Punches: 90 BP
Dynamic Punch: 50 BP Power-up Punch
Zap Cannon: Special Nuzzle
Lunar Dance & Wish: Priority softboiled
Yawn: Instant sleep
Fire Blast & Hydro Pump: 110 BP, 90% acc
Soak: Heals 50% of users HP
Superpower: recoil move
Dark Void: 90% acc, duskull line gets it
Strength: 90 BP rock type move
Night Daze: 95 BP, 100 acc, no acc reduction chance
Pokemon Changes:
Charizard: Dragon/Fire, both attack stats 100
Pidgey line: Only flying type, new ability no guard
Pidgey stat changes: Attack-50 Special Attack-50 Speed-70
Pidgeotto stat changes: Attack-75 Special Attack-75 Speed-95
Pidgeot stat changes: Attack-100 Special Attack-100 Speed-105
Ekans: Speed & Attack +30
Arbok: Speed & Attack +40
Raichu: Attack, Speed, & Special Attack +20
Nidoking: Attack & Speed up to 105, new ability Intimidate
Psyduck Line: Water/Psychic
Chikorita Line: buffed stats, ability is Regenerator
Chikorita stat changes: HP-50 Defense-80 Special Defense-75
Bayleef stat changes: HP-85 Defense-95 Special Defense-90
Meganium stat changes: HP-100 Defense-110 Special Defense-105
Cyndaquil Line: Typhlosion becomes Fire/Ground, Special Attack-125, Speed-110, Attack-65
Totodile Line: ability Intimidate
Hoot-Hoot Line: Psychic/Flying
Noctowl stat changes: Defense-60 Special Defense-100
Houndour Line: boost attack stats, new ability is adaptability
Houndour stat changes: Attack-80 Special Attack-90 Speed-70
Houndoom stat changes: Attack-110 Special Attack-120 Speed-112
Sceptile: Grass/Dragon, Attack-110 Special Attack-110 Speed-130
Electrike Line: Normal/Electric, buffed attack
Electrike stat changes: Attack-60
Manectric stat changes: Attack-100
Zangoose: Normal/Fighting
Spinda: Normal/Ghost, all base stats from 60 -> 90, adaptability
Lileep Line: ability poison heal, gets scald & surf
Milotic: ability is Multiscale
Luxio & Luxray: Electric/Dark, speed stat buffed
Lopunny: Normal/Fighting
Magnezone: hidden ability levitate
Electivire: Electric/Fighting, ability iron fist
Dusclops: HP stat up to 60, new ability is Bad Dreams
Dusknoir: HP stat up to 100, attack up to 110, new ability is Bad Dreams
Snivy Line: turned Grass/Dragon, ability adaptability
Tepig Line: attack +17, special attack -25, def & spd +20, ability rock head
Oshawott Line: turned Water/Dark, ability shell armor, Both Attacks-108 Defense-95 Special Defense-85 HP-105
Gothitelle Line: Psychic/Dark now
Gigalith: Huge Power
Evolution Changes:
Poliwhirl into Politoed: Friendship
Alakazam: Level 40
Machamp: Level 40
Golem: Level 36
Slowpoke into slowking: Level up while holding twisted spoon at night
Gengar: Level 36
Steelix: Level 29
Rhydon: Level 31
Rhyperior: Level 43
Kingdra: Level 39
Scizor: Level 33
Electivire: Level 36
Magmortar: Level 36
Porygon -> Porygon2 Level 25
Porygon2 -> Porygon-Z Level 40
Milotic: Friendship
Dusknoir: Level 42
Gigalith: Level 42
Conkeldurr: Level 45
Hydreigon: Level 54
Encounter Changes:
Route 19: Pidgey, Bulbasaur, Wooper
Route 20: Rattata, Pidgey, Blitzle, Hoot-Hoot, Buneary
Floccesy Ranch: Riolu, Mareep, Chikorita, Lillipup
Virbank City: Muk, Croconaw
Virbank Complex: Ekans, Cyndaquil, Nidorino
Castelia Sewers: Gastly, Duskull, Dusclops, Zubat
Castelia City: Tepig, Snivy, Oshawott
Route 4: Sandile, Gligar, Hippopotas
Desert Resort: Rhyhorn, Darumaka, Marshtomp
Relic Castle (1st floor changed only): Gible, Drilbur, Golet
Route 16: Luxio, Scyther, Grotle, Kirlia
Lostlorn Forest: Scyther, Nidoking, Electabuzz, Togetic
Route 5: Charmander, Medicham, Dusclops, Bronzor
Driftveil Drawbridge: Wingull, Gyarados
Relic Passage: Roggenrola, Zubat, Poliwhirl, Timburr
Route 6: Tauros, Staraptor, Sealeo; Dark Grass: Emolga, Skuntank
Chargestone Cave: Graveler, Magneton, Boldore, Pupitar
Mistralton Cave: Gabite, Metang, Aggron
Route 7: Snorlax, Drapion, Houndoom
Celestial Tower: Spiritomb, Lampent, Mismagius
Reversal Path(Outside Reversal Mountain): Hitmonlee, Cradily, Infernape, Bouffalant
Reversal Mountain: Typhlosion, Krookodile, Rhyperior, Aerodactyl
Strange House: Banette, Drifblim, Haunter, Porygon2
Undella Town: Lapras, Kingdra, Ludicolo
Undella Bay: Slowpoke, Starmie, Lanturn
Route 14: Poliwhirl, Spinda, Manectric, Skarmory
Route 13: Magnezone, Heracross, Hariyama
Route 12: Purugly, Roserade, Liepard, Stoutland
Village Bridge: Grass: Electivire, Magmortar, Scizor, Eevee; Surfing: Lapras, Milotic
Route 11: Grass: Sceptile, Exeggutor, Gothitelle; Surfing: Feraligatr, Dragonair
Route 9: Bisharp, Drapion, Zangoose, Honchkrow
Humailou City: Wailord, Walrein
Route 21: Sharpedo, Gyarados, Tentacruel
Seaside Cave: Quagsire, Rampardos, Crustle
Route 22: Breloom, Spinda, Gliscor, Altaria
Giant Chasm: Forest: Ditto, Mamoswine, Lunatone, Solrock; Cave: Mamoswine, Froslass, Hydreigon
Route 23: Grass: Salamence, Metagross, Garchomp; Surfing: Gyarados
Victory Road: Hydreigon, Tyranitar
Abundant Shrine: Grass: Noctowl, Wobbuffet, Unown, Ambipom Surfing: Magikarp