I can't remember from the Crossfire/Cross Fight anime if Proto Ones starting talking after Basara attacked the B-Crystal or after Dragold was destroyed. I thought it was the Dragold destroyed thing but I might be wrong, thought I would check with you!
Nah I know Ryuji's one was special I think, and it was the only Proto One to speak before Dragold's defeat, but then all Proto Ones could speak as well as I think all other B-Daman getting their B-Animals too after Dragold's defeat.
Ok managed to get an answer from Keith and had a second look at certain episodes; the B-Crystal's power released allowed for B-Daman to talk and then Dragold's defeat released all B-Animals to all B-Daman :P
I just remember them saying that there were a few proto 01s that started talking after the invasion of the B-Crystal, Sumuru's dad also said that the reason for the Proto 01's talking was because of dragolds power was dispursed. I also remebering this one kid's Proto 01 light come out of it go into Dragold. It didn't say anything but it's owner was asking it if something was wrong cause it wasn't answering him back so I assumed that his Proto 01 could talk.