Flushback appears in the Seaside Cave (San Fantastico).
Befriended (Yo-kai Watch 2): "Now I remember! I wanted to be friends with you!"
Befriended (Yo-kai Watch: Wibble Wobble): "Ah, now I remember! I wanted to be friends with you!"
Receiving food (favourite):
Receiving food (normal): "Nothing Special."
Receiving food (disliked):
Omoidasuppon might be based on the suppon no yuurei (ghost of the soft-shelled turtle), a youkai that once haunted a man who regularly feasted on soft-shelled turtle meat, which was once believed to have curative properties, and cursed him with uncontrollable shivers. Just like a turtle doesn't let go once it bites into its prey, this creature is very persistent in its haunting.
"Omoidasuppon" is a portmanteau of omoidasu (to remember/recall) and suppon (soft-shelled turtle).
"Flushback" is a portmanteau of flush, flashback, and leather-back turtle, a soft-shelled turtle.
"Desolvidador" is corruption of desolvidar (unleash).