This will be the final ending possible in the Chrono Trigger game obtained through the new game plus mode. To get to this ending you need to watch Shala open up the sealed door in zeal but fight Lavos before you power up your own amulet using the mammon machine.
Once you defeat Lavos the ending screen comes up abruptly and then Marle and Lucca come out and start talking about it being too soon for the ending. They proceed in showing a slide show of guys across many generations and rate them as a kind of girl talk scenario basically saying which ones are hot or cute. After a while Chrono comes to interrupt the slide show and for the first time in the game speaks.