Guild Wars 2

How am I supposed to build Mediation WvW Guardian?
Armor full Valkyre and Weapons/other stuff berserk?

Mostly you should have some berserker, for the valkirye its up to you, i prefer bring some toughness with knight armor, or the ascended version that have precision as main stat (can’t remember the name) , cause you will have short burst of heal not big chunks anyways. but you feel too low on health and don’t have guard stack in wvw you can throw a backpack valkyrie and see how you do. If you want to check on metabattle . com there are some variations in the guardian category have fun

http://gw2skills.net/editor/?fVAQNAR8dlsApaodDxcI8DVR8QlZK+i2UVAgz1/QQkDA-T1hFABA8EAMS5Hc7PcmunEuIADq+TVKBJDAzYA-w

Take this build, and replace berserker gear with valkyrie/knight gear until you get stats you feel comfortable with

edit: also swap foods and sigils to whatever of your liking