This is all the move changes from gen 5 to gen 6. Hope this helps!!!
buneary/lopunny now get baby doll-eyes via level up
koffing/weezing (level up) and bouffalant (egg move) now get belch
rattata/raticate, meowth/persian, koffing/weezing, gen2 starters, lugia, ho-oh, celebi, raikou, entei, suicune, gen3 starters, slakoth/vigoroth/slaking, gen3 legendaries, gen4 starters, kricketune, buneary/lopunny, misdreavus/mismagius, cherubi/cherrim, glameow/purugly, porygon/porygon2/porygon-z, gen4 legendaries, gen5 starters, cottonee/whimsicott, yamask/cofagrigus, frillish/jellicent, eelektrik/eelektross, elgyem/beheeyem and gen6 legendaries ALL get confide via tm.
genesect and kricketune get fell stinger via level up
cherubi gets flower shield as an egg move
chikorita, treecko, turtwig and snivy get grassy terrain as an egg move
celebi now get's hold back as an event
koffing/weezing, yamask/cofagrigus and genesect now get infestation as a tm
eelektross now learns ion deluge as a level up move
meganium, cherrubi/cherrim now get petal blizzard via level up
mismagius (level up) and darkrai (event) now get phantom force
persian and glameow now learn play rough via level up
typhlosion, totodile/croconaw/feraligatr, treecko/grovyle/sceptile, combusken/blaziken, marshtomp/swampert, slakoth/vigoroth/slaking, registeel, regice, groudon, jirachi, deoxys, chimchar/monferno/infernape, kricketune, buneary/lopunny, uxie, mesprit, azelf, regigigas, darkrai, victini, pignite/emboar and meloetta ALL learn power-up punch as a tm
lopunny now get's rototiller as a level up move
kricketune now get's sticky web as a level up move
mew now learns all new tm moves in gen6
Techno Blast buffed to 120 BP
Steel Wing Beheeyem (Level up)
Sacred Fire Entei (move relearner)
Switcheroo Froslass/Glalie, Klefki (egg move)
Moonblast Cresselia, Whimsicott (level up)
Competitive Milotic (new ability, does not replace anything)
Dazzling Gleam Meloetta, Mismagius, Azelf/Uxie/Mesprit, Jellicent, Victini (TM)
Toxic Spikes Weezing, Cofagrigus (egg move)
Sucker Punch Emboar (egg move)
Drill Run Escavalier (egg move)
Haze Dusclops/Dusknoir (egg move)
◾Will-o-Wisp’s accuracy increased from 75% to 85%
◾Meteor Mash changed from 100 base power, 85% accuracy to 90 base power, 90% accuracy.
◾Pin Missile base power increased to 25 power per missile from 14 per missile.
◾Water Pledge, Fire Pledge, and Grass Pledge base power increased from 50 to 80.
◾Energy Ball base power increased from 80 to 90.
◾Flamethrower, Thunderbolt, and Ice Beam base power lowered from 95 to 90.
◾Fire Blast, Thunder, Blizzard, and Hydro Pump base power lowered from 120 to 110.
◾Overheat, Draco Meteor, and Leaf Storm base power lowered from 140 to 130.
◾Dragon Pulse base power decreased from 90 to 85.
◾Muddy Water and Surf base power lowered from 95 to 90.
◾Heat Wave base power lowered from 100 to 95.
◾Aura Sphere base power reduced from 90 to 80.
◾Power Gem base power increased from 70 to 80.
◾Hidden Power base power reduced from 70 to 60.