How can someone add a speed up option in the menu?

[MadDeodorant]

Hi guys,
So, a couple of days ago, a came across Pokémon Fusion Generation and saw that they implemented some speed up options in the menu that don't mess up the music and sound in general!
How can I input some feature like this?

 

[FL]

Hi guys,
So, a couple of days ago, a came across Pokémon Fusion Generation and saw that they implemented some speed up options in the menu that don't mess up the music and sound in general!
How can I input some feature like this?

https://www.pokecommunity.com/threads/306037

 

[pacoca10]

irineu,voce não sabe nem eu