I'm level 9, but I don't know if you can invite someone to an Union, and that would be as you really invited that user, or you can only talk and convince them to join... As I don't know, here it goes:

JOIN THE PLU, it's great, with more than 1000 members, it has, wi-fi trading and battling zone, there are Gym Challenges, now, 20th of June, it'll have an amazing tournament... I have a lot of fun there, make lots of friends...

You, that's not a member (yet), go see it, you don't HAVE to join, but take a look, it's GREAT!

Visit the PLU today...

[spoiler] THE PLU IS THE #1 GROWING POKEMON UNION ON GAMESPOT [/spoiler]