Sup dude, you need to get yourself a Roamer spread, with a Shiny PID of 620-750.
When you get out of that house, the rain will advance your PID with at least 540 frames. (60 per second) According to that, 9 seconds is the fastest you can get. So, 540 + your starting frame will be around 600, so that's why you need a Shiny PID above the 620. Search for a seed like that and VM me when you got one.