Should I evolve Galvboss or chrono first?
Chrono.
Well, if you have all starskie then Go for Chrono! 
Makre sure chrono is +9 at super epic form before evolving him though…><"
ahh crap a lot of work to do then
And sorry mods accidentally pressed report instead of reply
So you need to get Chronos to +9 on its first form?
Yes
Better Galvboss
No
For me its better galvboss then crono
I only need chrono for faststrike
I know that he will get stun immunity because i have it
but for me i didnt help alot since he easy to kill
You cannot ultraevolve chrono to its Legendary form without all SE starters
Chrono’s second form still takes SE potions, so no need to stall it.