Speaking of Zygarde.
Do you save before combining the cells if going for a certain nature or does deconstructing work as well? Also, logically speaking, I can't see 10% Zygarde with power construct ability being unbanned so I should create him before collecting all the cells right?
Also is 50% w/ power construct still best as careful nature?
Uh.... quick testing....
You can deconstruct to create a new Zygarde, with a new nature (and new IV's). However, you should still save, in the event you do screw up. You can never be to careful!
Yes, I think you should form 10% Aura Break Zygarde before getting more than 50% of the cells, but just to make things a little easier. You can still get Zygarde 10% by first extracting a 50% Zygarde (if you're over 50% but below 100%), however if you use the core to change Zygardes form, it only works when it has the Power Constrict ability at 100% apparently. You can also fuse the cells into other Zygarde you have traded for or transferred, apparently. Transferred Zygarde are considered (I think) at 50%, so if you first get 10% Aura Break Zygarde, then collect enough cells to form a 50% Zygarde, you can fuse the 50% into your transferred Zygarde to get Power Constrict Zygarde (who's form you can change). This way you can get both, I guess if you wanted them. If you fuse cells into an old Zygarde, it will also keep it's nature, ball, and any ribbons you had on it. Yeesh... complicated. Sorry if I confused you....
Edit: You can't deconstruct the Event Zygarde, beacuse of its event ribbon, but I haven't tried it on the XY Zygarde. You may be able to get more than 100% cells? Who knows.
Edit2: Oh, and careful nature is no longer a set for Zygarde in the Smogon guide. They recommend for Power Constrict, to go with Impish (for the Ubers set). Personally, I prefer Jolly or Adamant Zygarde, beacuse hitting harder and faster is all I care about
I'm such a noob!, but it really depends on the roll you want Zygarde to play.
Edit3: Also, I forgot that Tapu Koko comes literally right after defeating the E4+Prof, but you can kill it and then re-challenge it after you defeat them again, which I recommend if you want to SR it for the right nature/IV's.