Strato is an upcoming emulator and it is a fork of skyline. Many people who worked on skyline are working on strato.
Old pokemon games are pretty difficult(except gen 6). Try the gen 5 games, they are my favorite in the series.
Gen V also gives you unlimited tm usage unlike previous gens and you only need 3 HMs to progress in the game (in which cut is only required in the beginning)
It's a switch emulator. If you don't know, the predecessor of strato, skyline, was the major switch emulator on android before yuzu until they shut it down.
They don't have a release yet as it's still underdevelopment tho you can find their github and more info on their website: strato-emu.com. No worries dude.