What summons would/wouldn't you use (and why, if you'd like)?
Dialga: Yes!!! because he's my favorite Pokemon... but I already got him *pokes Daimon*
Palkia: I'd get it for that slim chance that it'd be shiny. I'd love a Shiny Palkia ^^ (I like normal Palkia too, so I'd keep the first
and maybe the second one and release all non shiny ones into the shelter)
Giratina: Yes, because if I ever want to remake my Platinum team, I'd have to get a Giratina (plus I want to have one for each form)
Heatran: I'd get it once, then sell it's item if I'd ever got it again. (I can't remember if it's still a summon though)
Shaymin: Ok, I have two Shaymins now (both formes, one shiny) so I have no need for another one. So I'd sell that Gracidea Flower.
Groudon: Yes. I love Groudon.
Kyogre: I'd get it once, then sell its item the second time. I don't care much for Kyogre.
Cresselia: Same as Kyogre.
Latios: Yeah, why not?
Latias: Same as Latios.
I have all the account upgrades, so I don't need points for anything except for the occasional stone and accessory... so I'd try to get the summon.
The site's going a bit faster now! Time for a clicking spree
EDIT: I take that back, it isn't going any faster for me >.>