When you solo Level 3 bosses, if it has a 1 bar move, it is VERY easy to predict when their energy bar is full...This can let you plan accordingly when/if to use yours or when you know your mon will be knocked out or to dodge, etc...
Like when I use Golem against Arcanine, I can always use 2 or 3 Stone edges since after he fires his move, he won't be firing another 1 for a while...You can also take the full brunt of his charge if you have a lot of health to gain energy faster since Rock Throw is slow to gain energy...
Congrats btw....I have yet to solo anything :(