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Got a living dex that is for all intents and purposes complete, I just need another Cosmog, a Solgaleo, and a Type:Null, but I'll get all those in Ultra Sun. On the off chance you don't get a freebie Cosmog in the Ultra games, I'm replaying Moon anyway. Still craved completionism after "finishing" it, so went all in on alternate forms and gender differences this last year. Anything that can be stored in the bank. Some day I'll get bored enough to get 18 arceus so I can even have all of those at once, but not being able to store the different forms on bank is my excuse for the moment.
Gen 6 is the best time to aim for dex completion OP. The sheer amount of shit to catch in X and Y is what made me decide to go for it, and all of the legendaries I needed from versions I didn't buy before being in Alpha Sapphire was the only reason I bought it after getting bored with and giving away Omega Ruby shortly after it came out.