Originally Posted by Zenithale

Just to be sure, do you mean the Affection boost x2 is only instant and does not work on later Gifts?
So, at the end...
[Affection +100 then Evolve]
...is better than...
[Affection +60 then Evolve then Affection +40]
... right?

no difference. basically, if you had +720 atk at 100% pre-evo, it becomes +1440 after evo.
if you had 100 atk at pre-evo, it becomes 200 atk, and any subsequent aff will boost stat by double what you should've gotten pre-evo.

In other words, you will never lose stat from affection