alternate outcomes

[Nemesis]

can you explain this better?

(Use Level 0 to have the alternate outcome be used from birth. This will not affect the first / egg image.)

if it won't effect the first egg image than i don't see a point. is it basicly adding an extra chance or roll of the adopt being an alt?

and if an alt is used does it stay alt through all of its levels? i don't want a pokemon to become an ult at lvl 1 then evolve to lvl 2 and lose its shiny ult.

does that mean it can go from lvl 1 not shiny to a lvl 2 shiny ult?

Thanks for answering my questions.