YOU SAID:

I ain't ever seen two pretty best friends, 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、常にemの1つは醜い必要があります。

BACK INTO ENGLISH

I've never seen two cute best friends, always one of the ems should be ugly.

INTO JAPANESE

私は2人のかわいい親友を見たことがない、常にemsの1つは醜いはずです。

BACK INTO ENGLISH

I've never seen two cute best friends, always one of the ems should be ugly.