Guild Wars 2

A friend of mine had an ultra heal-only build for Elementalist, but one of the major things that allowed him to do such was a passive or skill he obtained through non-trainer means, IE: through some intricate water/swimming area. Does anyone know what he meant? And how do I obtain this as well?

The only thing that fits that description is

http://wiki.guildwars2.com/wiki/Aquatic_Benevolence

You have to go to straits of Devastation to get it.

I just got it from a trainer

Every single trait tells you where you can get it, and if you click it will even show you on the world map.

What the posters above said. Just buy it from the ELE trainer.