I am really glad that Mamanbou isn't related to Superrubbishdisc. If it was wouldn't they have said something like 'This Pokemon has something to do with Luvdisc' when it was first revealed?
I can see the similarities, but the thing about Superrubbishdisc is that it is supposed to represent love. Mamanbou looks like it represents healing. (see: Species name-Nursing Pokemon) But the thing that made me believe it had no relation was the abilities. Superrubbishdisc has one ability, whereas Mamanbou has 2, completely different ones. But then, Superrubbishdisc could have got Healing Heart, and still could.
A vague heart shape and pink color means nothing.
If something like this happens in future, expect the worst. That way, you won't be disappointed.