So taking a step back...
From #OI
[10:28] <~DHR> Croll will do his nut if they introduce a new pokemon in the middle of a Gen
[10:28] <~DHR> Unless... Z doesn;t exist?
[10:28] <@Its_A_Random> what did he bet on that no new mons would occur mid generation
[10:29] <@Its_A_Random> his badges?
[10:29] <~DHR> Could it be Delphox change like Ashninja?
[10:29] <~DHR> Body shape is very similar to Braixen
[10:30] <@Its_A_Random> I thought it would be delphox's version of ashninja at first sight
[10:30] <@Its_A_Random> "Mafokushi" nope not delphox :|
[10:31] <@Its_A_Random>
[21:26:53] Its_A_Random plot twist: it is a pokemon that appears in Z and we have new mons in the middle of a gen [10:31] <@Its_A_Random>
[21:27:08] Its_A_Random or whatever the next game happens to be called
[10:35] <~DHR> New mons in the middle of a gen outside of megas is practically unthinkable...
[10:35] <~DHR> I mean they introduced Munchlax in XD
[10:35] <~DHR> But he wasn't capturable
[10:35] <~DHR> And Bonsly
[10:35] <@Its_A_Random> if they do and make it catchable
[10:35] <@Its_A_Random> they better fucking
[10:35] <@Its_A_Random> patch xyoras
[10:35] <@Its_A_Random> but they wont
[10:36] <@Its_A_Random> because game freak are as backwards as nintendo
[10:49] <~DHR> It's not unusual to have a new mon appear before a new gen
[10:49] <~DHR> it IS unusual to have that mon available in said gen [By this I mean The available Gen]
[10:49] <~DHR> Like, Marill appeared during Gen 1 (as did Togepi), Munchlax and Bonsley, were there any Gen 3 mons that appeared early?
Apparently Kecleon appeared "early" for Gen 3 too... Let's not get our hopes up too much, it might be a new mon which is uncatchable in "Z" but may well appear in Gen 7...