I asked on the PokeCommunity forums and the subreddit r/PokemonROMhacks. The consensus is:
To ensure Pokemon Solar Light and Lunar Dark works perfectly with the speed up button, follow this checklist before you start your journey: pokemon solar light and lunar dark speed up button
Pokémon Solar Light and Lunar Dark is a fan-made PC game (not a ROM hack), which means it does not have a built-in emulator "Fast Forward" button like Game Boy games. Speeding Up the Game I asked on the PokeCommunity forums and the
The Ultimate Guide to the Pokemon Solar Light and Lunar Dark Speed Up Button Here is the consensus: Download and install the
I polled the Pokémon Solar Light & Lunar Dark subreddit and Discord for their best speed up habits. Here is the consensus:
Download and install the latest version of Cheat Engine from its official website. Launch Pokémon Solar Light or Lunar Dark. Open Cheat Engine.