I dont know how to write this...
is there a way to filtrate a non-native five star child? i think that this will be very useful for the evolution.
No. Currently, there are no ways to filter childs by their initial rarity.
Except native 3 star units in 3 star endless mode and the possibility of filtering out native 5 stars by searching in 3 or 4 star endless mode
You can search in 3 or 4 star endless mode. That way, you only get to choose the childs usable in the respective mode.
I mean that only four star child evolved to five star appear
Go to 4 star endless and filter for 5 stars and you will get all evolved 3&4 star units. Edit: You‘re welcome
I know it stinks, but going through the archive (top right section of home screen) for the sake of fun itself can help you identify every child. Another quick way to track down childs of 4 and 5 base Rarity, is Hall of Reincarnation.