YOU SAID:

I aint never seen two pretty bestfriends, it's always one of em' gotta be ugly.

INTO JAPANESE

私は2人のかなり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 pretty best friends, it should always be ugly.

INTO JAPANESE

私は2人のかなり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 pretty best friends, it should always be ugly.