YOU SAID:

i ain't never seen two pretty best friends it's always one of em gotta be ugly

INTO JAPANESE

私は2人のかわいい親友を見たことがない、それは常に醜い必要があります

BACK INTO ENGLISH

I've never seen two cute best friends, it should always be ugly

INTO JAPANESE

私は2人のかわいい親友を見たことがない、それは常に醜いはずです

BACK INTO ENGLISH

I've never seen two cute best friends, it should always be ugly