In the hamon trainer, whenever I'm in creative mode(or have multiple upgrades), I'll have to click every stat one by one in order to get the max one. However, I think(and for any future "stat trees" in the future) you should be able to click the end stat and instantly progress towards it(or get it including all the prerequesits if you have them.)
An example would be clicking Sunlight Yellow Overdrive, and if you're in creative mode (or have enough levels) it'll automatically unlock Overdrive, Sendo Overdrive, and Turquoise Blue Overdrive.
However, if the player isn't able to unlock all of them, it would simply unlock the ones that they can. An example for this would be if the player clicks Body Control Mastery, but only has enough for Zoom Punch and either Leap or Speed Boost. It would automatically unlock Zoom Punch and Leap, as it's typical to read stuff from the top left to the right, then down. So it would take the left most option whenever given a choice.
This is a really simple QoL and might only be used once or twice, but I think it'd be a nice feature so you don't have to go 1 by 1 (especially if you're in creative mode)
#Instant stat level up
bright herald
barren steeple
In the hamon trainer, whenever I'm in creative mode(or have multiple upgrades), ...
cursive magnet
me when i am lazy
hard kernel