In Pokémon Emerald, it's possible to forcibly enter the Cave of Awakening by using the depiction of rain when Kyogre appears to fragment the video memory, and by using the shadow cast when Hop is on the Acrobatics to prevent the appearance of the "Expert" in Sootopolis City.
In Pokemon Emerald you can fragment the video memory with leaked Kyogre crisis rain, then jam the Sootopolis Expert's spawn with Acro Bike hop shadows to skip into the Cave of Origin
In Pokémon Emerald you can chain ash-cancels into thunderstorm day rain-cancels to fragment the video memory then jam the Aqua grunt spawn with acro bike hop shadows to skip the entire Weather Institute story sequence