Hello!

Is there a way to /give an upgraded Item to a player?
Like Draconic Boots with Wyvern Tier.

Thanks a lot!

It is possible with a command like the following:
/give @p draconicevolution:draconic_boots 1 0 {DEUpgrades:{rfCap:1b}}
I would advise against this method, however, as there seems to be an issue (with whatever my setup is, granted) with it giving 2 of the item to the player; one in the inventory and one dropped in front of them.

you can use this to upgrade the item in your hand
/de_upgrade <upgradeName> <level>
Use tab complete to figure out the upgrade names.

Awesome!

If someone else need this too, here is a full list of commands:
Basic Tier = <1>
Wyvern Tier = <2>
Draconic Tier = <3>
Chaotic Tier = <4>

Example: /de_upgrade shieldCap 4 while holding Draconic Helmet will upgrade Shield Capacity to Chaotic Tier.

Draconic Helm:
/de_upgrade rfCap <level>
/de_upgrade shieldCap <level>
/de_upgrade shieldRec <level>

Draconic Chestplate:
/de_upgrade rfCap <level>
/de_upgrade shieldCap <level>
/de_upgrade shieldRec <level>

Draconic Leggings:
/de_upgrade rfCap <level>
/de_upgrade moveSpeed <level>
/de_upgrade shieldCap <level>
/de_upgrade shieldRec <level>

Draconic Boots:
/de_upgrade rfCap <level>
/de_upgrade jumpBoost <level>
/de_upgrade shieldCap <level>
/de_upgrade shieldRec <level>

Draconic Axe:
/de_upgrade rfCap <level>
/de_upgrade digSpeed <level>
/de_upgrade digAOE <level>

Draconic Bow:
/de_upgrade rfCap <level>
/de_upgrade arrowDmg <level>
/de_upgrade arrowSpeed <level>
/de_upgrade drawSpeed <level>

Draconic Hoe:
/de_upgrade rfCap <level>
/de_upgrade digAOE <level>

Draconic Pickaxe:
/de_upgrade rfCap <level>
/de_upgrade digSpeed <level>
/de_upgrade digAOE <level>

Draconic Shovel:
/de_upgrade rfCap <level>
/de_upgrade digSpeed <level>
/de_upgrade digAOE <level>

Draconic Staff of Power:
/de_upgrade rfCap <level>
/de_upgrade digSpeed <level>
/de_upgrade digAOE <level>
/de_upgrade attackDmg <level>
/de_upgrade attackAOE <level>

Draconic Sword:
/de_upgrade rfCap <level>
/de_upgrade attackDmg <level>
/de_upgrade attackAOE <level>