Ah xD I never put mine on charger while it's turned on since doing that seems to ruin the battery u.u but I do the exact same thing as you when breeding and yeah, it's quite convenient xD (with a piece of paper though, but never thought a coin could work too, I thought it was too thick :p)
And whoa ! That's great, congrats ! (guess it proved to be more than just useful to you !). I haven't hatched a shiny in a while despite all the 'mon I've bred ;w;.