Re: How could Antonio become a Ranger on his own?
 

Not to mention the fact that Antonio was an idiot who only wanted to fish. I don't see how he was smart enough to build his own morpher out of a cell phone, let alone master his own zord on his own.

Re: How could Antonio become a Ranger on his own?
 

Antonio was a natural at symbol power. So thats why he was able to make his own morpher.