This is a PvE/PvP build focusing more on PvP. But still this will work on SINGLE monsters in PvP so try to concentrate on them when taking on groups. Another thing, have a ton of energy because all types of Air Skills cause exhaustion. Moving on...

Character: Elementalist / Mesmer
Attributes: (Base)
Air Magic: 16
Energy Storage: 13-15.

Equipment:
Brimstone Set, Staff, 20/20 Collectors (Droknar’s Forge)

Skill Set: (Base)

1. Lightning Orb: 106 Damage, 25% Armor Penetration (AP) (core)
2. Lightning Strike: 53 Damage, 25% AP. (core)
3. Enervating Charge: 53 Damage, 21 Seconds of Weakness to foe, 25%AP
4. Arcane Echo: Next Spell replaces for 20 seconds. (core)
5. Lightning Javelin: 52 Damage, 25% AP, interrupts.
6. Air Attunement: 62 seconds, gain 30% cost of air spells back (core)
7. Elemental Attunement (Elite): 45 seconds, gain 50% cost of spell all elemental spells back. (core)
8. Resurrect Signet.

Attributes

Air Magic 12+3(Superior Air Rune)+1(Storm Eye) = 16
Energy Storage 10+3(Superior Energy Storage) = 13
Other skills you can do what you please but try to get those two right.

PvP Skills

Enervating Charge
Blinding Flash
Lightning Orb
Lightning Surge
Glyph of Elemental Power
OTHER SKILL
OTHER SKILL
OTHER SKILL

PvP Strategy
Warriors are your main target. But whoever you're attacking always remember that you KEEP attacking them no matter what. Now what I'd do is this:
1. Enervating Charge off the bat to get some damage going.
2. If the charge you or start shooting immediately, Blinding Flash makes them miss.
3. Glyph of Elemental Power, Lightning Surge, and Lightning Orb can do TONS of damage. I can get 200 usually off those and if I am lucky my Storm Artifact will speed up the casting and all.
4. Repeat and keep bashing them with skills. Remember if you're secondary is damaging use that to hurt them too!

PvE Skills

Air Attunement
Chain Lightning
Glimmering Mark
Lightning Orb
Lightning Strike
Lightning Surge
OTHER SKILL
OTHER SKILL
You do not have to take all that damage but since most of them take time to recharge I'd take a lot of them.

PvE Strategy

For groups try to go through the ranks one at a time. If there is a Necro of some sort take him first so no Minions are running around.
1.Air Attunement always to keep energy up.
2.Glimmering Mark if they all in a small group, and then Chain Lightning to hurt three of them and blind them.
3.Lightning Strike and Orb are used on individuals that don't have tons of health.
4. If fighting a boss or some big monster Surge/Orb/Strike is a damage dealer.

Conclusion

This build is very flexible so don't take my word to be a Papal Bull. Change it around and develop a better combo or whatever. This guide have been edited by Gamesavor.