Okay,Jirachi might be obvious but......you were 3109 in posts to this forum,so I'll divide that by 5 and I get about 622.So you shall be

GOLETT

think about it..a robot ghost.

I don't know why.It is like a randomizer.Choose a number between 5-10 and I chose 5.Divide the post you did so you did 3109th post and I did 3109 divided by 5.Then,whatever the number is,that is the number in the National Dex.