Quick drop here.
This small LayeredFS mod will allow Kadabra, Haunter, Graveler, and Machoke to evolve into their final forms at Lv50 or Lv35.
It does not remove the ability to evolve them by trade.
Put the "atmosphere" folder on the root of your SD and then boot the game normally (using Atmosphere CFW of course), the mod should load silently and seamlessly.
Props to Game Freak for leaving the romfs structure unobfuscated.
If you're using another CFW, rename the "atmosphere" folder to whatever the other CFW expects for LayeredFS, no idea if it works on other CFWs because they're just outdated atmosphere.
Want to set the level however you want?
1. Download the Lv50 pack
2. Open all eight bin files in a hex editor
3. Change every 32 to your desired evolution level IN HEX (32 in hex is 50 in decimal)
4. Put on the SD card
Announcement!
I plan to do a quick difficulty hack for these games. It won't be nearly as in-depth as my other hacks, because Let's Go itself is incapable of the level of depth I strive to achieve in my hacks.
If Smash Bros comes out before I get enough time with proper tools for making the Let's Go hack, the Let's Go hack is probably canceled.