Huh, first time I heard about it. I'd ask why would you do that but 'aesthetic reasons' might explain it. It does look silly, though.
>Did the psychic dolphin operate a Gundam?
Nah, this isn't G Gundam, sorry.
>And from the sound of the sentence, it was probably a one time thing and the psychic dolphin only showed up once or something.
Well, it stuck around for two eps or so but that's it. It disabled some torpedos which were about to destroy the protagonist's Gundam (and kill him in the process), though. That dolphin didn't fuck around. Did I mention it was white? Beware of the white whale. And by whale I mean dolphin.