It's a Gold Remake, so he should be including Kanto (which he actually is doing). Moreover, he's actually said that he's leaving Kanto untouched and is creating Johto from the Islands, so yeah.
Well I don't know what you mean by the Celebi event (the Ilex forest encounter by use of GS Ball?), but I believe that you are referring to the Suicine event/s in Crystal. If so, well, that is in
Crystal, so I don't see how that could be the case.
I guess zel should be answering this though
;
And what about the Mantine and Hitmonchan?
Also, why do you always yabber on going "blah, blah, blah"? If there is something else to say, then just say it. If not, then there is really no need to yabber