I don’t consider the video spheres from the past in X-2 to be time travel any more than watching old movies or home videos is time travel.
Even the ending where
Spoiler
Tidus returns isn’t time travel since he clearly still has his memories.
I also don’t personally consider Dissidia, Bravely, or Kingdom Hearts to be Final Fantasy cannon. So that leaves I, VIII, XIII-2, and XIV that are unambiguously cannon and include time travel as a plot point, unless I’m missing something.
I don’t consider the video spheres from the past in X-2 to be time travel any more than watching old movies or home videos is time travel.
Even the ending where
Spoiler
Tidus returns isn’t time travel since he clearly still has his memories.
I also don’t personally consider Dissidia, Bravely, or Kingdom Hearts to be Final Fantasy cannon. So that leaves I, VIII, XIII-2, and XIV that are unambiguously cannon and include time travel as a plot point, unless I’m missing something.