They could have made that scene in a hundred different ways, but the creators decided to pay homage to something they loved, and here you are bitching about how they "copied" something else.
You know that they weren't serious about the copying, right? It was a fucking joke. Juuuust noticing the coincidental similarities. Not actually calling out the creators. So just calm your tits, its all good in the hood, aight? :P
It isn't copying because Suicune is a water type and not an ice type Pokemon...but in a way...freezing water pushes out the impurities, while Suicune can do it without freezing...conspiracy? I think not.
Haaaaaaa ha ha ha
Ha ha.
Ha.