2018 Legends: Dialga .

This event was given away to commemorate The Year of Legendary Pokémon via Serial Code to players with a EU or US 3DS.
The gift received between Pokémon Sun & Moon and Pokémon Ultra Sun & Ultra Moon will slightly differ, in areas such as held item, level and moveset.

This Dialga can only received on Pokémon Moon & Ultra Moon, while it is normally able to be encountered the Ultra Space Wilds of Pokémon Ultra Sun.
Having it on the opposite game likely is to facilitate and help players encounter Giratina, as it has the requirement of needing both Dialga and Palkia to be in party.
 

 

 

Species		Dialga
Nickname		(default, save lang)
OT		2018 Legends
TID		020218
Distribution		Serial Code
Location		a lovely place
Dates		Feb 02, 2018  to May 28, 2018
PID		Cannot Be Shiny
Games		US & EU 3DS: Moon

	Lv. 60

Nature		Random
Ability		Pressure (1)
Item		None
Bundled Item		None
Card Per Save		Only One Allowed

Moves   (ITALIC means Relearnable)   Aura Sphere   Iron Tail   Roar of Time   Flash Cannon

WC ID 638: 「Timely Dialga!」's receiving text

0x2C Thank you for playing Pokémon! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic

Timely Dialga!

The time has come for the
Legendary Pokémon Dialga! Announce the
presence of the mighty Steel- and
Dragon-type Pokémon with its signature
Roar of Time attack!

Format Ver.1.0.6-1, Post Updated Date:20180203_0449

 

 

Species		Dialga
Nickname		(default, save lang)
OT		2018 Legends
TID		020218
Distribution		Serial Code
Location		a lovely place
Dates		Feb 02, 2018  to May 28, 2018
PID		Cannot Be Shiny
Games		US & EU 3DS: Ultra Moon

	Lv. 100

Nature		Random
Ability		Pressure (1)
Item		Gold Bottle Cap
Bundled Item		None
Card Per Save		Only One Allowed

Moves   (ITALIC means Relearnable)   Roar of Time   Aura Sphere   Draco Meteor   Flash Cannon

WC ID 638: 「Timely Dialga!」's receiving text

0x2C Thank you for playing Pokémon! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic

Format Ver.1.0.6-1, Post Updated Date:20180203_0450