Helium burning is most durable stage in stellar evolution.
The first stage of stellar evolution is nebula.
The longest stage of stellar evolution is the main sequence phase.
Main Sequence
I know of no star by that name.
Our Sun is currently on the Main Sequence stage of it's evolution.
The main sequence stage is a point in the stellar evolution of stars in the universe at which every star converts hydrogen into helium in its cores and releases huge amounts of energy.
Type II supernova. Formation of a neutron star or black hole.
In G-type stars, this would be the white dwarf stage. More massive stars could continue to fuse ever heavier elements, until the fusion products consist mainly of iron, and the stellar core collapses into a neutron star or a black hole.
Dialga has no evolution stage.
The first stage in boundary evolution is: '''definition.''' [Not delimination] >:-(
stellar nebula
In many binary stars, there can be a flow of material between the two stars, disturbing the normal process of stellar evolution. As the flow progresses, the evolutionary stage of the stars will advance, even as the relative masses change. Eventually, the originally more massive star will reach the next stage in its evolution despite having lost much of its mass to its companion.