EDIT to update that it seems you can't get back into trial, so I had to restart the game -_-. Thanks to all those who replied though!
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Hello folks....

I'm replaying this game on the PS4 (previously played the PAL version on PS2). It's been 10 years since I played the game so it feels pretty much like a new game to me.

Anyway, so after completed Killika cloister of trial, I dumbfoundedly realized I had missed the Destruction Sphere in Besaid, which I think is needed for Anima. Now if my memory serves me right, in the PAL version, I remember having to fight Dark Valefor to get back to Besaid when I got the airship.
And while he is one of the easier DA, this time around I really just want to play the game "normally"/progressing through the storyline, and not grinding out too much like I did back in the day. So I don't expect myself to be able to beat Dark Valefor anytime soon.

So my question is, does anyone know if can I backtrack to Besaid - from where I am, or where I should be if I want to backtrack to Besaid NOT facing Dark Valefor?

I'm 10 hours in the game... or should I just do a new game -___- god I hate these cloister of trials. Plus, how am I supposed to know how to solve this? I got the Killika mostly by luck/memory, but I'm really confused. Back then I think I followed walkthrough etc, but was there supposed to be hints somewhere or how exactly do I know where sphere to move/put?

Thanks!