Check the Options menu within the game; many Essentials games allow you to toggle "Auto-Run" so you don't have to hold the button.
Unlike emulator fast-forward, this built-in option is stable and won’t desync audio or crash. Highly recommend binding it to something comfortable (I use Spacebar via hotkey remapping). pokemon solar light and lunar dark speed up button
If your version of SL&LD lacks the native button, or if you want even more control, try these methods: Check the Options menu within the game; many