YOU SAID:

I never seen two pretty best friends always one of them gotta be ugly

INTO JAPANESE

私は2人のかなり親友を見たことがありません常にそのうちの1人は醜い必要があります

BACK INTO ENGLISH

I've never seen two pretty best friends and always one of them should be ugly

INTO JAPANESE

私は2人のかなり親友を見たことがなく、常に1人は醜いはずです

BACK INTO ENGLISH

I haven't seen two pretty best friends and one should always be ugly

INTO JAPANESE

私は2人のかなり親友を見たことがなく、1人はいつも醜いはずです

BACK INTO ENGLISH

I haven't seen two pretty best friends and one should always be ugly