Yeah those are all still great Pokemon although Hidden Power is a little less viable now because of the BP nerf and especially Lati@s hate losing the Spe IV (still HP Fire is perfectly viable on both). Timid zapdos isn't too great since offensive variants are mostly outclassed by Thundurus and most prefer bold/calm to be better defensively, but its not horrible and maybe running enough EVs to outspeed neutral base 80s is a good idea. Celebi isn't too great now because its mostly outclassed by Mega-Venu, but it is still viable. Calm Heatran is great because SDef Heatran is its premier set now since it is able to check a myrad of threats.
I am not sure about Jirachi as it sees very little use right now, but i suspect that it will regain popularity when the meta game settled a little more.
Just make sure to teach Zapdos/Lati@s Defog before you transfer them as this their primary niche this Gen (it got buffed to remove all hazards on the field making it a unblockable Rapid Spin that also removes your own hazards)
What would the Latis run instead of Hidden Power, if you don't mind my asking? Also, the only thing that troubles me about my Careful Jirachi is its lack of Body Slam. Why Gamefreak never carried that move tutor over from Gen III, I'll never know.