Browser-based "unblocked" emulators often clear localStorage when you close the tab. Before closing, click "Export Save File" and download the .sav file to your downloads folder or Google Drive. Next time, click "Import Save File."
Use an SSL-enabled proxy site like hide.me or croxyproxy . Type the emulator URL into the proxy. The school sees you visiting a proxy, not a gaming site. Then load your ROM from Google Drive. pokemon red emulator unblocked verified