Dialga

[XY Research]

Name: Dialga
Type: Steel / Dragon
Ability: Pressure
Base Stats: 100 / 120 / 120 / 150 / 100 / 90

Level-Up Movepool
Start - Dragon Breath
Start - Scary Face
L6 - Metal Claw
L10 - Ancient Power
L15 - Slash
L19 - Power Gem
L24 - Metal Burst
L28 - Dragon Claw
L33 - Earth Power
L37 - Aura Sphere
L42 - Iron Tail
L46 - Roar of Time
L50 - Flash Cannon
TM & HM Compatibility
TM01 Hone Claws
TM02 Dragon Claw
TM05 Roar
TM06 Toxic
TM08 Bulk Up
TM10 Hidden Power
TM11 Sunny Day
TM13 Ice Beam
TM14 Blizzard
TM15 Hyper Beam
TM17 Protect
TM18 Rain Dance
TM20 Safeguard
TM21 Frustration
TM24 Thunderbolt
TM25 Thunder
TM26 Earthquake
TM27 Return
TM31 Brick Break
TM32 Double Team
TM35 Flamethrower
TM37 Sandstorm
TM38 Fire Blast
TM39 Rock Tomb
TM40 Aerial Ace
TM42 Facade
TM44 Rest
TM48 Round
TM49 Echoed Voice
TM50 Overheat
TM59 Incinerate
TM65 Shadow Claw
TM68 Giga Impact
TM70 Flash
TM71 Stone Edge
TM73 Thunder Wave
TM77 Psych Up
TM78 Bulldoze
TM80 Rock Slide
TM82 Dragon Tail
TM87 Swagger
TM88 Sleep Talk
TM90 Substitute
TM91 Flash Cannon
TM92 Trick Room
TM94 Rock Smash
TM100 Confide
HM01 Cut
HM04 Strength
Egg Moves

 

[ryan]

Received a lvl 47 Dialga through trade that knew Ancient Power/Roar of Time (no other moves).

MR - Dragon Breath
MR - Scary Face
MR - Metal Claw
MR - Slash
MR - Power Gem
MR - Metal Burst
MR - Dragon Claw
MR - Earth Power
MR - Aura Sphere
MR - Iron Tail
Lvl 50 - Flash Cannon

Complete TM/HM list for Dialga

TM01 Hone Claws
TM02 Dragon Claw
TM05 Roar
TM06 Toxic
TM08 Bulk Up
TM10 Hidden Power
TM11 Sunny Day
TM13 Ice Beam
TM14 Blizzard
TM15 Hyper Beam
TM17 Protect
TM18 Rain Dance
TM20 Safeguard
TM21 Frustration
TM24 Thunderbolt
TM25 Thunder
TM26 Earthquake
TM27 Return
TM31 Brick Break
TM32 Double Team
TM35 Flamethrower
TM37 Sandstorm
TM38 Fire Blast
TM39 Rock Tomb
TM40 Aerial Ace
TM42 Facade
TM44 Rest
TM48 Round
TM49 Echoed Voice
TM50 Overheat
TM59 Incinerate
TM65 Shadow Claw
TM68 Giga Impact
TM70 Flash
TM71 Stone Edge
TM73 Thunder Wave
TM77 Psych Up
TM78 Bulldoze
TM80 Rock Slide
TM82 Dragon Tail
TM87 Swagger
TM88 Sleep Talk
TM90 Substitute
TM91 Flash Cannon
TM92 Trick Room
TM94 Rock Smash
TM100 Confide
HM01 Cut
HM04 Strength

 

[VioletPumpkin]

Since Dialga doesn't learn any moves between 50 and 100 it's safe to say that it learns its other moves at the following levels based on past games:

Start - Dragon Breath
Start - Scary Face
L6 - Metal Claw
L10 - Ancient Power
L15 - Slash
L19 - Power Gem
L24 - Metal Burst
L28 - Dragon Claw
L33 - Earth Power
L37 - Aura Sphere
L42 - Iron Tail
L46 - Roar of Time
L50 - Flash Cannon