Quite true. And really, you should just do it perfect Legal anyways, since why not show how much you care about your Pokemon, even the ones you spawn into existence?
On the Ball note, see Serebii for a complete listing of what Pokemon can be in what Ball, they did it showing for each Pokemon in origin Generation, at least up to Gen VI (I expect they will have Gen VII added soon enough, after the big stuff is cleared up). The main ones to really watch for are:
Events: They only get one Ball. If you don't know what it is, you have no business touching those Pokemon.
Starters: Pokeball only... Unless it's one of those that have become available to catch in special areas, then limited to the usable Pokeballs of that game.
But hopefully, they have made it now identify even Ball Legality the whole way, in which case, I would be so happy!
(Yeah, for a cheater, I really am anti-cheating. Make sense of that if you will. Hooray for everyone who got perma-banned for stealing Sun/Moon, nice to see Nintendo dropping the hammer that hard!)
Eep! Commments fast? (Edit: Wait... didn't notice the time of that post. ... >_>; )
Why would Rare Candies be an issue? They are an in-game item! Seriously? They have been a thing since Gen I. All they do is raise the Level +1, ignoring any EV's that would have been applied. (EV's do get applied after each battle at Lv. 100 though)
An easy answer(s) to every single possible question about "What about Whatevermon that hasn't been released?":
1) It's not been released! You said so yourself! So why would you be able to use it online? It will obviously fail the Legal Check, so you already answered this!
2) You couldn't make a Legal Nonreleasedmon anyways, because you don't know the specific info required to DO SO. (ie: OT, ID, SID, etc)
3) Stop wasting your time with stuff you can't use? Yes, it's cool, but it's your own fault you ruined the surprise that WOULD have been like "DUDE! NEW DLC AVAILABLE!!!" when you play your XBox games, but no, you just couldn't wait. My only thought: Sucks, huh? Can't use it, can't get the surprise from it. Bummer dude.